Latest TCS Aptitude Question SOLUTION: Find the last non zero digit of 96!. a) 2 b) 4 c) 6 d) 8

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(#M40011551) TCS question Keep an EYE

Find the last non zero digit of 96!.
a) 2 b) 4 c) 6 d) 8

Asked In TCS Subrat Baral (11 years ago)

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Read Solution (5) :

indrajit hui  (11 years ago)

it will be 6

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

abhishek singh  (11 years ago)

it will b 8....

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

jitendra birla  (11 years ago)

Z(n) denotes the last non zero digit in n!

Z(n) = {4 if tens digit is odd and 6 if tens digit is even) *
Z(n/5) * z(Units digit).

example

last digit of 96!

Z(96) = 6 * Z(96/5) * Z(6)
= 6 * z(19) * last non zero digit of 6!
= 6 * last non zero digit of 19! * last non zero digit of 6!
= 6 * by same process i got 2 * last non zero digit of (120)
= 6 * 2 * 2
= 24 (answer is the last digit ie 4)
= 4

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

RAHUL KUMAR  (11 years ago)

@ABHISHEK PLZ EXPLAIN HOW...

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

akram  (11 years ago)

it will be 4

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