What is the next number of the following sequence. 9, 19, 39, 79,.....

M4maths Previous Puzzles

01 Sep 2014 Sequence What is the next number of the following sequence. 9, 19, 39, 79,.....: OPtion
1) 199
2) 169
3) 159
4) 139
5) 119
6) 99
7) 79
8) 149
9) 89
10)None of these; Correct Option: 3 Best Solution (253)

NAVEEN KUMAR 9 years AGO

9,19,39,79...

The difference between 9 and 19 is 10
The difference between 19 and 39 is 20
The difference between 39 and 79 is 40
so, next diff=40*2=80
next number=80+79=159
or,
9+2*5=19
,19+2*2*5=39
39+2*2*2*5=79
similarly--79+2*2*2*2*5=159(option 3)

Like? Yes (29) | No (5)

Ranodeep Ghosh 9 years AGO

Double Previous Value And Add 1.
Answer. (c) 159
( 9*2 ) + 1 = 19
(19*2) + 1 = 39
(39*2) + 1 = 79
(79*2) + 1 = 159

Like? Yes (4) | No

Ankit Raj 9 years AGO

4,9,19,39,79
Let sequence be an, we have

a1 =4, an= 2*an(n-1)+1, for n>=2
Hence, the next term a6 = 2 a5 + 1 = 159

Like? Yes (4) | No

Nomendra Sinha 9 years AGO

9+10*(2^0)=19
19+10*(2^1)=39
39+10*(2^2)=79
79+10*(2^3)=159 answer

Like? Yes (4) | No (1)

anandhakumar 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (4) | No (1)

Harshad 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (2) | No

TANVI 9 years AGO

10+9=19
20+19=39
40+39=79
therefore
79+80=159

Like? Yes (2) | No

SAM 9 years AGO

Difference is like 10 , 20 , 40, 80....

Like? Yes (2) | No

sudhakar 9 years AGO

9+10 =19
19+(10*2) =39
39+(10*4) =79
79+(10*8) =159

Answer is option 3)159

Like? Yes (2) | No

selvakumar 9 years AGO

9+10 =19
19+(10*2) =39
39+(10*4) =79
79+(10*8) =159

Answer is option 3)159

Like? Yes (2) | No

jitendra varshney 9 years AGO

2*4+1=9,(multiply this 9 into 2nd term with2i.e 2*9+1=19)
2*9+1=19,(multiply this 19 into 3rd term with2)
2*19+1=39'
2*39+1=79'
2*79+1=159

Like? Yes (2) | No

ashok 9 years AGO

10,20,40,80

Like? Yes (2) | No

Vijay Menaria 9 years AGO

9*2+1=19
19*2+1=39
hence
79*2+1=159

Like? Yes (1) | No

RAKESH 9 years AGO

2*79 + 1 = 159

Like? Yes (3) | No (2)

shabih abbas 9 years AGO

79+80=159

Like? Yes (1) | No

krishna kanth 9 years AGO

9
9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

sumit 9 years AGO

logic 1:
9+10*2^0=19
19+10*2^1=39
39+10*2^2=79
79+10*2^3=159 opt(3) ans
logic 2:
2*previous+1=nxt no.
2*9+1=19
2*19+1=39
2*39+1=79
2*79+1=159 opt(3) ans

Like? Yes (2) | No (1)

Devendra Marghade 9 years AGO

9*2+ 1= 19
19*2+ 1=39
39*2+ 1=79
79*2+ 1=159

Like? Yes (2) | No (1)

Md.Sultan Khichi 9 years AGO

19-9=10.
39-19=20
79-39=40
So we are observing that the difference in always double of the previous.
So 79+80=159.
Ans. 159.

Like? Yes (1) | No

HARDIP BHALANI 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

BHANU KUMAR 9 years AGO

19-9......10
39-19......20
79-39........40
So next term is 159
159-79.....80

Like? Yes (1) | No

Neel Patel 9 years AGO

19=2*9+1
39=2*19+1
79=2*39+1
so,2*79+1=159

Like? Yes (2) | No (1)

Aakash Jain 9 years AGO

difference between 9 ,19,39 and 79 is 10,20,40 so next number is 79+80=159

Like? Yes (1) | No

S.SHAFI 9 years AGO

9,19,39.79...

9*2+1 --> 19
19*2+1 -->39
39*2+1 --> 79
79*2+1 --> 159

Like? Yes (1) | No

anand vijay 9 years AGO

19-9=10;39-19=20;79-39=40
as we can see the difference between the two no increase two times the difference between the previous two no hence the next no should be x-79=2*40
=>x=159

Like? Yes (1) | No

SAYAN CHATTERJEE 9 years AGO

difference between the two consecutive no.s are in GP.
9+10=19
19+20=39
39+40=79
so,next=79+80=159 (3)

Like? Yes (1) | No

Mrityunjay 9 years AGO

1st number=(10*2^0)-1
2nd number=(10*2^1)-1=19
3rd number=(10*2^2)-1=39
4th number=(10*2^3)-1=79
so , the required number is
(10*2^4)-1=159

option: 3 is the correct answer

Like? Yes (1) | No

vivek 9 years AGO

as, 10*1-1= 9
10*2-1= 19
10*4-1= 39
10*8-1= 79
10*16-1= 159

Like? Yes (1) | No

Rahul shaw 9 years AGO

Multiplying difference between two numbers.

Like? Yes (1) | No

saikiran 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Dark Knight 9 years AGO

Diff between 10
The 20
Then 40
The 80 hence 159

Like? Yes (1) | No

posirajesh 9 years AGO

Difference between side by side numbers got doubled eachtime hence 159

Like? Yes (1) | No

SUNITEE GARIMA 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

Aravinth kumar 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

suman kumar 9 years AGO

1st number=(10*2^0)-1
2nd number=(10*2^1)-1=19
3rd number=(10*2^2)-1=39
4th number=(10*2^3)-1=79
similary, 5th number=(10*2^4)-1=159

Like? Yes (1) | No

piyush 9 years AGO

19-9=10
39-19=20
79-39=40
159-79=80
so option 3} 159

Like? Yes (1) | No

ashvini kumar 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

Inline Geek 9 years AGO

Nth term = (N-1)th term + 10 * 2^(N-2)

Like? Yes (1) | No

rakesh yadav 9 years AGO

take inly firsy digit.
as 0-1-3-7-15 because 3-1=2,7-3=4,15-7=8

Like? Yes (1) | No

Tejaswini 9 years AGO

diff btwn 9 nd 19 is 10
diff btwn 19 nd 39 is 20
diff btwn 39 nd 79 is 40
diff is doubld so ans is 159

Like? Yes (1) | No

Lipi Dutta Chowdhury 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Pusp raj singh 9 years AGO

79*2=158+1=159

Like? Yes (1) | No

rutuja 9 years AGO

Next no=Previous No*2+1

Like? Yes (1) | No

neelkanth thakur 9 years AGO

19=(9*2+1)
39=(19*2+1)
79=(39*2+1)
159=(79*2+1)

Like? Yes (1) | No

manish kumar singh 9 years AGO

diff. b/w 9 & 19 is 10
diff b/w 19 & 39 is 20

diff b/w 39 & 79 is 40

every time the diff is getting doubled so after 40
doubled value is 80
and the value will be added with 79
then we will get
79+80=159

Like? Yes (1) | No

BATTA JAGAPATHI BABU 9 years AGO

0+1 = 1
1+2 = 3
3+4 = 7
7+8 = 15

Like? Yes (1) | No

vikash kumar 9 years AGO

the next will be 159

Like? Yes (1) | No

Alok Ranjan 9 years AGO

last number*1+1

Like? Yes (1) | No

abhilasha 9 years AGO

add 1 to the previous no. and again add that no. to the next no. i.e.
9+1 = 10 +9 =19 ; 19+1 =20 +19 = 39 and so on

Like? Yes (1) | No

SHUBHAM DEEP SAXENA 9 years AGO

9+10*1=19
19+10*2=39
39+10*4=79
79+10*8=159

Like? Yes (1) | No

Jigyasa Kumar 9 years AGO

add 1 to the previous no. and again add that no. to the next no. i.e.
9+1 = 10 +9 =19 ; 19+1 =20 +19 = 39 and so on

Like? Yes (1) | No

shivam tiwari 9 years AGO

2x+1=next number
where x=current number

Like? Yes (1) | No

Kushagra Tiwari 9 years AGO

The difference between 9 and 19 is 10
The difference between 19 and 39 is 20

The difference between 39 and 79 is 40

So it looks as if the difference is being doubled each time, so the next answer will have a difference of 2*40, or 80
79+80=159

Like? Yes (2) | No (1)

Anshul 9 years AGO

9,19 (9*2 +1),39 (19*2 +1) ,79 (39*2 +1) so next is 79*2 +1 ie !59

Like? Yes (1) | No

NK Sinha 9 years AGO

9+10=19
19+20=39
39+40=79
So 79+80=159

Like? Yes (1) | No

Abhishek Vishwakarma 9 years AGO

9 and 19 diff is 10
19 and 39 diff is= 10*2 =>20

39 and 79 diff is=> 20*2 = >40

so the term has diff 2*40, or 80
79+80=159

Like? Yes (1) | No

Amit Toor 9 years AGO

next number is 1 more than double of current number
so next no = 79*2+1=159

Like? Yes (1) | No

vivek sah 9 years AGO

first difference is 10 then 10+10,=20,20+20=40,40+40=80,then 79+80=159

Like? Yes (1) | No

Shashi nath jha 9 years AGO

19= 9*2+1
39=19*2+1
79=39*2+1
159=79*2+1 ans.

Like? Yes (1) | No

Pranoy Bej 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Surabhi Dey 9 years AGO

Difference between unit digit of 9 and 19 is 1-0=0. Similarly, 1&3 is 3-1=2, 3& 7 is 7-3=4, hence 15-7=8.

Like? Yes (1) | No

v pavan 9 years AGO

let number be x.
pattern is x*2+1

Like? Yes (1) | No

jagriti goomer 9 years AGO

ans.159
nth term= ((n-1)th term*2)+1
so next term is 79*2+1=159

Like? Yes (1) | No

vartika 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

ANAND KUMAR 9 years AGO

differences in numbers are 10 20 40 so there should be difference b/w 4th and missing n0. is 80
that's why 79+80=159

Like? Yes (1) | No

balagopalakrishna 9 years AGO

difference is 10,20,40
ie each is multiplaying by 2
so next term is 80 and is added to 79
so 79+80=159

Like? Yes (1) | No

Prashant Rupnur 9 years AGO

difference doubles

Like? Yes (1) | No

Arijit Acharyya 9 years AGO

next number=previous-number*2+1

Like? Yes (1) | No

ANAND SHARMA 9 years AGO

9,9+10,19+20,39+40,79+80=159 hence 159 is the answer

Like? Yes (1) | No

Mogilipuri.Harish 9 years AGO

19-9=10
39-19=20
79-39=40

here the difference is doubled so 40*2=80
then 80+79=159

Like? Yes (1) | No

Avinash Aryan 9 years AGO

9
19=9+10
39=19+20
79=39+40
then 79+80=159

Like? Yes (1) | No

Jasmita Parmar 9 years AGO

9 + 10 = 19
19 + 20 = 39
39 + 40 = 79

Here 10*2 =20 , 20*2= 40 then next value to be added is 40*2 = 80 .

So 79 + 80 = 159

Like? Yes (1) | No

suraj Khanduri 9 years AGO

9+10= 19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Hanuman Prasad 9 years AGO

80*2-1=159

Like? Yes (1) | No

Venkateswarlu 9 years AGO

79+80=159

Like? Yes (1) | No

divyesh jesadiya 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

kundan kumar 9 years AGO

19-9=10
39-19=20=10*2
79-39=40=20*2
159-79=80=40*2

Like? Yes (1) | No

NAGENDRA P 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159
So option is (3)

Like? Yes (1) | No

sabir ahmd 9 years AGO

(9*2)+1=19
(19*2)+1=39
(39*2)+1=79
(79*2)+1=159

Like? Yes (1) | No

ADARSH GAURAV 9 years AGO

19-9=10
39-19=20
79-39=40
since diff. are in G.P.
so next term will be 79+80=159
159 is the answer.

Like? Yes (1) | No

ANSHIKA JAIN 9 years AGO

19-9=10
39-19=20
79-39=40
each time the difference is doubled
so 79+80=159
next number will be 159

Like? Yes (1) | No

Anand Dwivedi 9 years AGO

See Form
19-9=10
39-10=20
79-39=40

Since All Values that is Add Which is Just Double To previous One . So Next turm Will be 40*2=80
So 80+79=159

Like? Yes (1) | No

kondapalli Madhuri 9 years AGO

9+1*10=19,19+1*20=39,39+1*40=79,79+1*80=159.
double the number and add to previous number

Like? Yes (1) | No

sudipta maji 9 years AGO

79+80=159

Like? Yes (1) | No

Anand Jha 9 years AGO

because the series is an addition of 10,20,40,80,and so on

Like? Yes (1) | No

Gokul Krishnan 9 years AGO

9,19,39,79,?
hence diff is 10,20,40,80
diff is consecutive multiple of 2
now the ans is 159

Like? Yes (1) | No

MANJUSHA VUYYURU 9 years AGO

on subtracting we get successively 10,20,40 next is 80 gap

Like? Yes (1) | No

Dharampal 9 years AGO

19-9=(10)
39-19=(20)
79-39=(40)
159-79=(80)

Like? Yes (1) | No

Nitesh Kishore Kashi 9 years AGO

Diff is of 10 20 40.. So next no has diff of 80
79+80=159

Like? Yes (1) | No

vaishnavi 9 years AGO

difference between two consecutive number is 10,20,40 respectively
thats why next diff should be 80
so next number will be 79+80=159

Like? Yes (1) | No

G.Mahesh 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Soham Chakraborty 9 years AGO

9,9+10,9+20,9+40,9+80 where 10,10*2,20*2,40*2

Like? Yes (1) | No

LOKESH SAMANT 9 years AGO

01 SEP 2014 : Sequence What is the next number of the following sequence.
9, 19, 39, 79,.....

Like? Yes (1) | No

Koushik Dawn 9 years AGO

19=(9*2)+1;
39=(19*2)+1;
79=(39*2)+1;
Then (79*2)+1=159

Like? Yes (1) | No

Tapobrata Banerjee 9 years AGO

the diff vl b 10,20,40,80 like this.....so the next no. of 79 shld b 79+80=159.

Like? Yes (1) | No

Nilay 9 years AGO

19-9=10
39-19=20
79-39=40
So next difference would be 80(10,20,40,...)
Hence,79+80=159..

Like? Yes (1) | No

rakesh 9 years AGO

increment by 2 times

Like? Yes (1) | No

Vanika 9 years AGO

9*2 + 1 = 19
19*2 +1 = 39
similarly 79*2 +1 = 159

Like? Yes (1) | No

Abhishek Mitra 9 years AGO

the series is following this pattern..
9*2+1=19
19*2+1=39
39*2+1=779
79*2+1=159

Like? Yes (1) | No

chandra mondal 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

Sukanya 9 years AGO

+10, +20,+30,+40

Like? Yes (1) | No

Ajay Kumar Gupta 9 years AGO

Gap is 10,20,40.
Then next gap between 79 and next no. is 80.
Then 79+80=159.

Like? Yes (1) | No

ANKITA prasad 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

adarsh kumar yadav 9 years AGO

next number=number*2+1;
so 79*2+1=159

Like? Yes (1) | No

Ramya 9 years AGO

difference 80 should be added.Hence 79+80=159

Like? Yes (1) | No

vivek 9 years AGO

difference between two term increase in order-
10,20,40,80
so ans. is 159

Like? Yes (1) | No

Lakshmi Narmada 9 years AGO

9+1*10=19
19+2*10=39
39+4*10=79
79+8*10=159

Like? Yes (2) | No (1)

Devendra Kumar 9 years AGO

Successive addition of 10,20,40.80

Like? Yes (1) | No

SUNIL 9 years AGO

7*2+1=15
159

Like? Yes (1) | No

prathibha 9 years AGO

9
9+10(9+1)=19
19+(19+1)=39
39+(39+1)=79
79+(79+1)=159

Like? Yes (1) | No

Nitish Kumar 9 years AGO

difference increase in GP.10,20,40,60

Like? Yes (1) | No

Mohit Gulia 9 years AGO

9×2+1=19
19×2+1=39
39×2+1=79
79×2+1=159

Like? Yes (1) | No

sandeep singh 9 years AGO

since 9+0=9
9+10=19
19+20=39
39+40=79
so 79+80=159

Like? Yes (1) | No

Souvik Datta 9 years AGO

the difference between those numbers are in G.P
That means 10,20,40 next is 80
79+80=159

Like? Yes (1) | No

LOKENDRA SINGH RAO 9 years AGO

every times difference getting double
9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

ESHA 9 years AGO

its in the difference of 10,20,40,80

Like? Yes (1) | No

Rakesh Dutta 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159(option 3)

Like? Yes (1) | No

Pradeep Saw 9 years AGO

10*1-1
10*2-1
10*4-1
10*8-1
next is
10*16-1=159

Like? Yes (1) | No

g lokesh 9 years AGO

19-9=10, 10*2=20,
39-19=20, 20*2=40,
79-39=40, 40*2=80,
79+80=159

Like? Yes (1) | No

Enukonda Ramakrishna 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
& 79*2+1=159

Like? Yes (1) | No

prasanna pan 9 years AGO

1st digit : 9
2nd digit: 9*2+1=19
3rd digit:19*2+1=39
4th digit:39*2+1=79

so next digit will be : 79*2+1 = 159

Like? Yes (1) | No

maddineni venkateswara rao 9 years AGO

10,20,40,80............ this is the difference

Like? Yes (1) | No

Suganya 9 years AGO

19-9=10
39-19=20
79-39=40*2=80
79+80=159

Like? Yes (1) | No

abhinaw kumar 9 years AGO

(9*2)+1=19
(19*2)+1=39
(39*2)+1=79
(79*2)+1=159

Like? Yes (1) | No

veera swamy vanguri 9 years AGO

09,
(0+1)9=19
(1+2)9=39
(3+4)9=79
(7+8)9=159

Like? Yes (1) | No

Vikas 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159
Ans is 159.

Like? Yes (1) | No

Sourav Patra 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

Varunraj Reddy 9 years AGO

9, 19, 39, 79,....
Differences 10,20,40,....
next difference is 80
So 79+80=159

Option 3)

Like? Yes (1) | No

pramita raha 9 years AGO

19-9=10
39-19=20
79-39=40
so the next term will be 79+80=159

Like? Yes (1) | No

MRITUNJAY KUMAR 9 years AGO

option 3)

Like? Yes (1) | No

krishnendu sen 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Supriya_kamkar 9 years AGO

numbers are (0+9),(10+9),(30+9),(70+9)
the difference are in sequence 10,20,40...so the next difference should be 80.... 79+80=159.

Like? Yes (1) | No

chauhan dhara vinayakkumar 9 years AGO

79+80=159

Like? Yes (1) | No

venkat 9 years AGO

It is increasing 10,20,40,80...

Like? Yes (1) | No

Shaban Ahmad 9 years AGO

9
9+10=19
19+20=39
39+40=79
79+80=159.

Like? Yes (1) | No

suman kumar 9 years AGO

after each step difference gets twice a 10,20,40 thus next be 80,so79+80=159

Like? Yes (1) | No

Dikesh Kumar Gumansingh 9 years AGO

19-9=10
39-19=20
79-39=40
10*2=20*2=40*2=80
79+80=159

Like? Yes (1) | No

deepesh singh panwar 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Anand 9 years AGO

19-9=10
39-19=20
79-39=40
79-159=80

Like? Yes (1) | No

VINAY KUMAR BHARATHA 9 years AGO

Here for the 1st term 10 is added to get 2nd term i.e, 19 and then for the 2nd term 10 is doubled i.e, 20 is added to get 3rd term i,e, 39 and for the 3rd term 20 is doubled i,e 40 is added to 3rd term to get 4th term ie,79.......so there for the 5th term 40 is doubled i,e 80 and is added to 4th term to get 159...

Like? Yes (1) | No

kokila 9 years AGO

9*1=9
9*2+1=19
9*4+3=39
9*8+7=79
the difference the 1 and 0 is 2 power 0
similarly 2 power 1 between 1 and 3 and 2 power 2 i.e 4 between 3 and 7

Like? Yes (1) | No

Ashish Jha 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

ravi shah 9 years AGO

19-9=10
39-19=20=10*2
79-39=40=20*2
next no=40*2=80, 80+79=159

Like? Yes (1) | No

T.VIGNESWARA REDDY 9 years AGO

Gap is 10 20 40 80 160 like that

Like? Yes (1) | No

Ramesh Sriram 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

sujeesh 9 years AGO

i dont know english how to tell u

Like? Yes (1) | No

Udhayanidhi N 9 years AGO

the difference between first two no.s is 10,next two no.s is 20,and the next two is 40,so the difference of the next no. will be 80....hence 79+80=159

Like? Yes (1) | No

AMIT SINGH 9 years AGO

unit place remains 9 at all the no.
tenth place changes accordingly like,
0*2+1=1
1*2+1=3
3*2+1=7
so, 7*2+1=15
hence next no. is 159.

Like? Yes (1) | No

Subbarayudu 9 years AGO

diff b/w 9 and 19 is 10
diff b/w 19 and 39 is 20
diff b/w 39and 79 is 40
so the diff is incresin double to previous one
so nextnum is 79+80 = 159

Like? Yes (1) | No

Janaga mageshkumar.v 9 years AGO

difference between the two are in sequence of 10,20,40.

Like? Yes (1) | No

kirti 9 years AGO

9+10=19+20=39+40=79+80=159

Like? Yes (1) | No

sruthi 9 years AGO

19-9=10
39-19=20
79-39=40
159-79=80
therefore 159 is the answer

Like? Yes (1) | No

mamta garkoti 9 years AGO

9*2+1=19,
19*2+1=39,
39*2+1=79,
79*2+1=159
so 159 is the next number of the series

Like? Yes (1) | No

Rahul Midha 9 years AGO

9+10=19, 19+20=39,39+40=79
so 79+80=159
the 2 nd term is getting multiplied by 2 each time..

Like? Yes (1) | No

swasthika 9 years AGO

(9 * 2) + 1 = 19
(19*2) + 1 = 39
(39*2) + 1 = 79
(79*2) + 1 = 159

Like? Yes (1) | No

MUNISH YADAV 9 years AGO

79*2+1=59
39*2+1=79
19*2+1=39
9*2+1=19

Like? Yes (1) | No

M Sandeep Reddy 9 years AGO

the numbers are 9 19 39 79 ?
difference b/w 1st and 2nd number is 10 and 2nd and 3rd is 20
3rd and 4th is 40 so next difference would be 80 adding 80 to 79 the ans is 159

Like? Yes (1) | No

manjusha 9 years AGO

9+10=19
19+10*2=39
39+20*2=79
79+40*2=159

Like? Yes (1) | No

parikshit digambar budhwant 9 years AGO

19-9=10
39-19=20
79-39=40
159-79=80; means that
10+10=20
20+20=40
40+40=80 so answer is three

Like? Yes (1) | No

sanjeev kumar 9 years AGO

79+80=159

Like? Yes (1) | No

shree 9 years AGO

15999999999

Like? Yes (1) | No

Dushyantsinh D. Jadeja 9 years AGO

19-9=10
39-19=20(10*2)
79-39=40(20*2)
so now 40*2=80 so 79+80=159

Like? Yes (1) | No

shashikanth 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159
the difference is being doubled after every addition

Like? Yes (1) | No

rangababu gudimetla 9 years AGO

to get next number in sequence..the difference between two numbers multiplied by 2 nd then add this to previous number..40*2=80+79=159

Like? Yes (1) | No

prem kumar 9 years AGO

(9*2)+1=19
(19*2)+1=39
(39*2)+1=79
(79*2)+1=159

Like? Yes (1) | No

sai 9 years AGO

difference is 10 20 40 next 80 so 159

Like? Yes (1) | No

Kuttyma 9 years AGO

Bcos 9+10=19
19+20=39
39+40=79
49+80=159
Ans:159

Like? Yes (1) | No

Hemadri 9 years AGO

0*2=0=09
0*2=0+1=19
1*2=2+1=39
3*2=6+1=79
7*2=14+1=159

Like? Yes (1) | No

Ritesh Prasad 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Priyanka barnwal 9 years AGO

9*2+1=19,
19*2+1=39,
39*2+1=79,
79*2+1=159.
hence option (3) is correct.

Like? Yes (1) | No

priyanka 9 years AGO

19-9=10
39-19=20
79-39=40
159-79=80
so answer is 159

Like? Yes (1) | No

swarup kumar prusti 9 years AGO

difference 10 20 40 80
so add 80 with 79=159

Like? Yes (1) | No

gurteg 9 years AGO

diff of 10,20,40.....so next will b of 80
79+80=159

Like? Yes (1) | No

RISHI 9 years AGO

let us consider the first number as n
Now,
we can see that the next number is (n*2)+1
Similarly, if we put n=9:
then,the next no. is (9*2)+1
Like this it continues....
and if we put n=79;
the next no. becomes (79*2)+1= 159
So, option 3)

Like? Yes (1) | No

NIVEDA SIVAPRAKASAM 9 years AGO

difference between 19 and 9 is 10
difference between 39 and 19 is 20
difference between 79 and 39 is 40
Here difference gets doubled.
So 79+80=159

Like? Yes (1) | No

Santosh Sharma 9 years AGO

10-1,20-1,40-1,80-1,160-1.

Like? Yes (1) | No

Rachit 9 years AGO

difference b/w no....10,20,40,80
and second reason.....
9*2+1=19,19*2+1=39,39*2+1=79..so in the same way..79*2+1=159

Like? Yes (1) | No

sivagami 9 years AGO

because 9*2+1=19
19*2+1=39
39*2+1=79
so 79*2+1=159

Like? Yes (1) | No

balaji.s 9 years AGO

9*2=18+1=19
19*2=38+1=39
39*2=78+1=79
79*2=158+1=159
ans:159 option : 3

Like? Yes (1) | No

N.HAROON RASHEEDH 9 years AGO

9+10=19,19+20=39,39+40=79.so 79+80=159

Like? Yes (1) | No

sayan pal 9 years AGO

9=9*1+(1-1)
19=9*2+(2-1)
39=9*4+(4-1)
79=9*8+(8-1)
hence,the next number is;
9*16+(16-1)=159 (ans).

Like? Yes (1) | No

ajit kumar 9 years AGO

10 20 40 80 gap so 79+80=159

Like? Yes (1) | No

Ashok 9 years AGO

9*2+1=19,
19*2+1=39,
39*2+1=79,
79*2+1=159

Like? Yes (1) | No

srinivas_msk 9 years AGO

the difference for each value is 10,20,40 so the next one's difference will be 80 and so the answer 159

Like? Yes (1) | No

Pranay Mukhopadhyay 9 years AGO

the difference between the numbers are 10, 20, 40, 80 and so on.....

Like? Yes (1) | No

Y V S Chandrakanth 9 years AGO

09+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

lakshmi nalluri 9 years AGO

series addition in the order of 10,20,40,80.

79+80=159

Like? Yes (1) | No

Siva Prakash 9 years AGO

19-9=10
39-19=20
79-39=40
So it looks as if the difference is being doubled each time, so the next answer will have a difference of 2*40, or 80
79+80=159

Like? Yes (1) | No

ganesh babu 9 years AGO

9, 9+10, 19+20, 39+40, 79+80=159

Like? Yes (1) | No

VIVEK KESHRI 9 years AGO

Like? Yes (1) | No

Nischay Jain 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

jai shree 9 years AGO

9+10 *1=19,19+10*2=39,39+10*4=79,79+10*6=159

Like? Yes (1) | No

ravi singh 9 years AGO

option(3) is right answer

difference is 10,2,40 hence next is 80

79+80=159

hence option 3 is correct answer

Like? Yes (1) | No

Rishabh Bakliwal 9 years AGO

19-9=10
39-19=20
79-39=40
159-79=80

Like? Yes (1) | No

chandan sharma 9 years AGO

9*2=18+1;19*2=38+1;39*2=78+1;79*2=158+1

Like? Yes (1) | No

T.RAJAMADHANGI 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

SHANMUGAPRIIYAN 9 years AGO

9+10=19 10+10=20
19+20=39 20+20=40
39+40=79 40+40=80
79+80=159
So,the answer is 159

Like? Yes (1) | No

Somnath 9 years AGO

19-9=10
39-19=20
79-39=40
119-79=80..... i.e difference follows an gp sequence with common ratio 20....

Like? Yes (1) | No

Jeevanantham.V.M 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Tapas 9 years AGO

Here the sequence is 9,19,39,79,....
we have to find the term after 79
the series will be 9,19,39,79,"159"
the difference between 19 & 9 is 19-9=10
the difference between 39 & 19 is 39-19=20
the difference between 79 & 39 is 79-39=40
the difference between "159" & 79 is 159-79=80
So the differences are in G.P with r=2 ..
ANSWER=159

Like? Yes (1) | No

JayaNagasri Valicherla 9 years AGO

9*2=18+1=>19
19*2=38+1=>39
39*2=78+1=>79
79*2=158+1=>159
so option 3)

Like? Yes (1) | No

ramakrishnateja 9 years AGO

each number in the series is the double of the previous number+1. so the number after the 79 is 79+79+1=159.

Like? Yes (1) | No

Piyush 9 years AGO

9, 19(9*2+1), 39(19*2+1), 79(39*2+1),
So ans is 159(79*2+1)

Like? Yes (1) | No

Kethineni Vinodh 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

Sagar Laxmikantrao Gomte 9 years AGO

Just focus that digit at unit's place is 9 , so it will remain 9
Now, look at every number which is at ten's place in all numbers...........
09.19,39,79,x...........

look at the difference in 09 & 19 there is a difference of 1,
difference between every two numbers is the addition of the differences between previous numbers......
09-19 (difference of 1 (0+1))
19-39 (difference of 2 (1+1))
39-79 (difference of 4 (2+1+1))
79-159 (difference of 8 (4+2+1+1))
In every difference 1 is added.....

Like? Yes (1) | No

ananthavalli 9 years AGO

19-9=10
39-19=20
79-39=40
It is a multiplication of difference*2
so then 40*2=80
79+80=159
so option 3) is correct

Like? Yes (1) | No

Srikanth 9 years AGO

(10-1),(20-1),(40-1),(80-1),(160-1)

Like? Yes (1) | No

vishnuvardhan 9 years AGO

9*2+1=19
19*2+1=39
39*2+1=79
79*2+1=159

Like? Yes (1) | No

vinusha reddy 9 years AGO

9,9+10=19,19+20=39,39+40=79,79+80=159

Like? Yes (1) | No

nassarshahab 9 years AGO

9*2+1,19*2+1,39*2+1,79*2+1=159

Like? Yes (1) | No

Mahak 9 years AGO

According to the series,
9
9+10=19
10+10=20 +19=39
20+20=40+39=79
40+40=80+79=159
Answer- (3)

Like? Yes (1) | No

Surit Datta 9 years AGO

The difference between 4 and 9 is 5
The difference between 9 and 19 is 10
The difference between 19 and 39 is 20

The difference between 39 and 79 is 40

So it looks as if the difference is being doubled each time, so the next answer will have a difference of 2*40, or 80
79+80=159
thats it..

Like? Yes (1) | No

Udhaya kumar 9 years AGO

9+10(2^x-1) where x=0,1,2,3,.....
at x=4 ...... corresponding value is 159.............

Like? Yes (1) | No

Shilpi Rani 9 years AGO

19*2+1=39,39*2+1=79,similarly79*2+1=159

Like? Yes (1) | No

kaushal kishor 9 years AGO

number increased in the order
2n+1

Like? Yes (1) | No

Sandeep Negi 9 years AGO

79×2+1=159

Like? Yes (1) | No

Saravjeet Singh 9 years AGO

(0)9=9
(1)9=19
(3)9=39
(7)9=79
(15)9=159

Like? Yes (1) | No

Proloy Mukherjee 9 years AGO

79+ (8*10)=159

Like? Yes (1) | No

TINKU MITTAL 9 years AGO

9,19,39,79,.....................
19-9=10
39-19=20
79-39=40....
so the next no should be
79+80=159

Like? Yes (1) | No

nisha sharma 9 years AGO

19-9=10
39-19=20
79-39=40
each is multiple of 2 hence
next is 79+80=159

Like? Yes (1) | No

Sandeep Kumar 9 years AGO

9*2 + 1 = 19
19*2+1=39
.
.
.
.
79*2 + 1 = 159

Like? Yes (1) | No

Ankit Sirohi 9 years AGO

series is (9*2)+1, (19*2)+1...so (79*2)+1=159

Like? Yes (1) | No

SUGAM 9 years AGO

9
19= 9+10
39=19+10*2
79=39+10*4
159=79+79+10*8

Like? Yes (1) | No

Gopinath 9 years AGO

9
(10)+9=19
(10*2)+19=39
(10*2*2)+39=79
(10*2*2*2)+79=159
ANS: 159

Like? Yes (1) | No

sonali kumari 9 years AGO

(9*2)+1=19
(19*2)+1=39
(39*2)+1=79
(79*2)+1=159

Like? Yes (1) | No

suraj kumar 9 years AGO

n*4+3

Like? Yes (1) | No

JESTIN SEBASTIAN 9 years AGO

9=10-1
19=20-1
39=40-1
79=80-1
10,20,40,80,160,...
160-1=159

Like? Yes (1) | No

dileep 9 years AGO

9,19,39,79
10-1=9
20-1=19
40-1=39
80-1=79
160-1=159

Like? Yes (1) | No

Tark Patel 9 years AGO

9,
19 (9*2 + 1),
39 (19*2 + 1),
79 (39*2 + 1)

hence next number will be,
79*2 + 1 = 159

Like? Yes (1) | No

Pratik Datta 9 years AGO

9*2 + 1=19
19*2 +1=39
39*2 + 1=79
therefore, 79*2 + 1=159

Like? Yes (1) | No

Tania Chatterjee 9 years AGO

The difference between 9 and 19 is 10
The difference between 19 and 39 is 20
The difference between 39 and 79 is 40

So it looks as if the difference is being doubled each time, so the next answer will have a difference of 2*40, or 80
79+80=159

Like? Yes (1) | No

Dinesh thatti 9 years AGO

if you take difference between above series we get 10,20,40

which means we are getting the double of 1st one so add double of 40 i.e 80 to 79 we get 159

Like? Yes (1) | No

anusha 9 years AGO

9*2=18+1=19
19*2=38+1=39
39*2=78+1=79
79*2=158+1=159

Like? Yes (1) | No

palasiva 9 years AGO

9 19 39 79
10 20 40 80
159

Like? Yes (1) | No

Nikhil 9 years AGO

9,19,39,79..and 159.
as 19-9=10
39-19=20
79-39=40
159-79=80

Like? Yes (1) | No

madhur garg 9 years AGO

ist time 20 difference second time 40 etc

Like? Yes (1) | No

ashok 9 years AGO

Tn=(10*2^(n-1))-1

T1=(10*2^0)-1=9
T2=(10*2^1)-1=19
T3=(10*2^2)-1=39
T4=(10*2^3)-1=79

T5=(10*2^4)-1=159

Like? Yes (1) | No

Kumar Vishal 9 years AGO

diff increasing in the order 10,20,40,80..

Like? Yes (1) | No

csemalli 9 years AGO

last number*2 +1

Like? Yes (1) | No

Apeksha Jain 9 years AGO

Answer is 159
9 *2=18 +1=19
19*2=38+1=39
39*2=78+1=79
79*2=158+1=159

So option 3

Like? Yes (1) | No

Sai Indu 9 years AGO

difference is 10 20 and 40...10*2=20+19=39
20*2=40+39=79
40*2=80+79=159

Like? Yes (1) | No

RAHUL UBHALE 9 years AGO

9*2=18 +1=19
19*2=38+1=39
39*2=78+1=79
79*2=148+1=159

Like? Yes (1) | No

Jameer Mulani 9 years AGO

9+10*1= 19
19+10*2= 39
39+10*4= 79
79+10*8= 159

Like? Yes (1) | No

APOORV 9 years AGO

19-9=10 than 10*2 is next differentiating value
lets see
39-19=20 hence we can predict from ques that 20*2 will be next differentiating number
so
79-39=40
so next differentiating value would be 40*2=80
to get next number to 79 we must add 80 to it
so 79+80=159
option 3) is correct

Like? Yes (1) | No

shobinya 9 years AGO

9*2=18+1=19
19*2=38+1=39
39*2=78+1=79
79*2=158+1=159
option(3)

Like? Yes (1) | No

nikhi 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No

Divya Aggarwal 9 years AGO

9*2=18 18+1=19
19*2=38 38+1=39
39*2=78 78+1=79
Similarly,79*2=158 and 158+1=159
so amswer is option 3 i.e. 159

Like? Yes (1) | No

prince 9 years AGO

79*2+1=159

Like? Yes (1) | No

MD SADDAM ANSARI 9 years AGO

9, 9+ 10, 19 +20, 39 +40,
so the next no will be 79 + 80= 159

Like? Yes (1) | No

saira fatma 9 years AGO

there is a pattern of 2*prv no +1
=79*2+1=159

Like? Yes (1) | No

shyamali kundu 9 years AGO

Here 9 then (9*2)+1=19 then(19*2)+1=39 (39*2)+1=79,(79×2)+1=159

Like? Yes (1) | No

ram prakash 9 years AGO

10 +20 +40+80

Like? Yes (1) | No

Ravi Bhalani 9 years AGO

9+10=19
19+20=39
39+40=79
79+80=159

Like? Yes (1) | No (1)

Dimple

India

Punjab

Time: 00:01:33

Points

Maths Quotes

Go down deep enough into anything and you will find mathematics.

Dean Schlicter

a man that is poor is very rich because he know the value of zero.

yash singh

Placed User Comments

M4Math helped me a lot.

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Thanks m4 maths for helping to get placed in several companies.
I must recommend this website for placement preparations.

yash mittal 4 years ago

What is the next number of the following sequence. 9, 19, 39, 79,.....

M4maths Previous Puzzles

01 Sep 2014 Sequence