Latest IBM Aptitude Question SOLUTION: What is the next number of the following sequence 9, 3, 6, 21, 9, 12, 33, 15, ...?

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What is the next number of the following sequence
9, 3, 6, 21, 9, 12, 33, 15, ...?

Asked In IBM neeraj (10 years ago)

Unsolved Read Solution (15)

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Read Solution (15) :

Akshay Agrawal  (10 years ago)

9-3=6
21-9=12
33-15=18 ANS

Is this solution Helpfull? Yes (24) | No (5)  

Akanksha Mishra  (10 years ago)

Look upon the series carefully
9,3, 6,21,9, 12,33,15

1st no - 2nd no. = 3rd no (it is the first multiple of 6)
9 - 3 = 6

4th no - 5th no = 6th no (it is the second multiple of 6)
21 - 9 = 12

similarly
7th no - 8th no = 9th no.(it will be 3rd multiple of 6)
33 - 15 = __
so answer will be 18

Is this solution Helpfull? Yes (14) | No (2)  

Akhil Baluja  (10 years ago)

6+3=9
9+12=21
then
15+18=33
so ans is 18

Is this solution Helpfull? Yes (3) | No (1)  

rashi gupta  (10 years ago)

9,3,6,21,9,12,33,15,x
9=3+6
21=9+12
33=15+x
=> x=18

Is this solution Helpfull? Yes (1) | No (1)  

Shreya Chatterjee  (9 years ago)

(9,3,6),(21,9.12),(33,15,?)
3*1=3
3*2=6
(3+6)=9
Similarly,3*3=9
3*4=12
(9+12)=21
So, 3*5=15
3*6=18
(15+18)=33
So ans is 18

Is this solution Helpfull? Yes (1) | No   

Ganeshkumar  (10 years ago)

9,3,6,21,9,12,33,15
here we are using method to get a solution is
substract 2nd number from 1st number inorder to get 3rd number i.e: 9-3=6
simailarly 21-6=9
finally 33-15=18
ANS:18 CORRECT

Is this solution Helpfull? Yes | No (2)  

anujnandwana  (10 years ago)

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Is this solution Helpfull? Yes | No (2)  

manisha  (10 years ago)

9-3=6
21-9=12
33-15=18

Is this solution Helpfull? Yes | No (2)  

bini  (10 years ago)

answer 18
3+6=9
9+12=21
18+15=33

Is this solution Helpfull? Yes | No (2)  

Gaurav Sain  (10 years ago)

18 is the next no. of the given sequence...coz
taking 3 no at once first_no = second_no. + third_no.
e.g. 9 = 3 +6
21= 9+ 12
33= 15+ 18

Is this solution Helpfull? Yes | No (2)  

kunal mistry  (9 years ago)

18
dividing the numbers by 3 we get the series as
3,2,1,7,3,4,33,15...

we can see that 3-2=1,7-3=4,11-5=6
so multiply 6*3=18

Is this solution Helpfull? Yes | No (1)  

lalit kumar  (9 years ago)

ans=18
exp.
9-6=3
21-12=9
33-x=15
x=18

Is this solution Helpfull? Yes | No (1)  

Richa garg  (9 years ago)

6+3=9
9+12=21
15+x=33
x=7.

Is this solution Helpfull? Yes | No (1)  

DEBOJIT CHATTERJEE  (9 years ago)

9, 3, 6, 21, 9, 12, 33, 15,x
9-3=6
21-9=12
33-15=18(Ans)

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suresh  (9 years ago)

(9-6=3)(21-12=9)
33-48=15..........ans is 48

Is this solution Helpfull? Yes | No (2)  

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