Latest TCS Aptitude Question SOLUTION: If all the numbers between 11 and 100 are written on a piece of paper. How many times will the number 4 be used?

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If all the numbers between 11 and 100 are written on a piece of paper. How many times will the number 4 be used?

Asked In TCS pre (10 years ago)

Unsolved Read Solution (25)

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Read Solution (25) :

Tanu  (10 years ago)

Answer is 19 only beacause 44 is counted twice

Is this solution Helpfull? Yes (36) | No (6)  

SANDEEP KUMAR SINGH  (10 years ago)

19, every word can only be appeared 20 times from 1 to 100. nd it is starting from 11, so 19 times used...

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

Helly shah  (10 years ago)

ans : 19
There are total 9 4's in 14, 24, 34...,94
& total 10 4's in 40,41,42....49
thus, 9+10=19...

Is this solution Helpfull? Yes (8) | No (1)  

sandy  (10 years ago)

ans is::19

Is this solution Helpfull? Yes (7) | No (7)  

Mills  (10 years ago)

ans is 18
14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94.

Is this solution Helpfull? Yes (7) | No (22)  

kanuru sree satya  (10 years ago)

19 is correct ans

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sandy  (10 years ago)

sorry guys its 18

Is this solution Helpfull? Yes (5) | No (20)  

SakthiPriya Ramakrishnan  (10 years ago)

THE NUMBER OF 4'S[CONSIDERING THE SINGLE OCCURENCE OF 4] IN THE RANGE 40-49 IS 10
THEN CONSIDER THE NUMBERS 14,24,34,44,54,64,74,84,94=9... SO TOTALLY 19...

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Sarthak Gupta  (10 years ago)

ANSWER:18
14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94

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lucky  (10 years ago)

19 is correct one

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Tanu  (10 years ago)

You are Welcome Mills :)

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ashviny  (9 years ago)

between 7 and 100
14,24,34,54,64,74,84,94=8 times
40,41,42,43,44,45,46,47,48,49=10 times, Here 44 will be counted another times
so 11 times.

8+11=19 times

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Himani sikarwar  (9 years ago)

18 is the correct ans

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dytort  (8 years ago)

total no. of words from 11 to 100 is 90
probablity of getting 4 at first position is 1/9
probablity of getting 4 at last position is 1/10
no. of fours = (1/9)*90 + (1/10)*90 = 19.

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

sumit  (5 years ago)

14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94------>19

note:-> hear 44 have two no of 4's

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

Tulja  (5 years ago)

Ans is 19
Consider the range from 12 to 99
Probability of getting 4 at Ones place is : 9c1*1c1 = 9*1 = 9
Probability o getting 4 at Tens place is : 1c1*8c1 = 1* 8 =8
Sum = 9+8 =17
Now consider the case of 44
Probability of getting 44 = 2! =2*1=2
So; Total = 17+2
=19

Is this solution Helpfull? Yes (1) | No   

Mills  (10 years ago)

thank you tanu.. now i understood it properly

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rishi pal  (10 years ago)

19
14,24,34,40,41,42,43,44,45,46,47,48,49,54,64,74,84,94

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subash  (10 years ago)

no. of 4 used in 11 to 100 is 19...

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VIVEK JAIN  (8 years ago)

ans 19
first count 4 in unit plac
then in tens place

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Rajanikanta Pradhan  (8 years ago)

19 times is correct ans

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Krinjal wankhede   (8 years ago)

19 is correct answer because, if we divide 11 to 100 in some section like 11 to 19, 20 to 29 ..... 90 to 99 except 40 to 49 there are total 8 4 coming and the very imp section i.e 40 to 49 contains 11 4 so 19 is the correct answer .

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Aparna Debnath  (8 years ago)

18 because for 11 to 100 in each row there is a 4 but in 44 there is two 4 so (14,24,34,44,54,64,74,84,94) a total of 10 4's and also in the row(41,42,43,45,46,47,48,49) a total of 8 4's.
so total 10+8=18.

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sireesha.yammanuru  (8 years ago)

Answr : 18
let us take _ _ two digit number
let fix the unit's place to 4 such as _ 4 then to fill ten's digit we can have 9 ways exlcuding 0 because given range is 11 to 100
now consider 4 in ten's digit it will be 4 _ here there are 10 ways of filling
total no. of 4 in btwn 11 to 100 is (9+10)-1
because as 44 will occur in both cases
thus total number of 4's is 18.

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Rahul Samal  (7 Months ago)

answer is 19 because 44 is counted twice

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