Kanbay - 51 factorial endedwith how many zeros?

GeekInterview.com > Placement Papers > Kanbay

Go To First | Previous Question | Next Question

Kanbay | Question 2 of 5

51 factorial endedwith how many zeros?

Total Answers and Comments: 4

Last Update: February 24, 2007 Asked by: munna

Sponsored Links

Best Rated Answer

—

No best answer available. Please pick the good answer available or submit your answer.

February 16, 2006 07:07:24

RE: 51 factorial endedwith how many zeros?

Factorial 0! equals 1

1551118753287380000000000000000000000000000000000000000000000000000

No of Zeros :52

Is this answer useful? Yes | No

February 18, 2006 10:03:02

Abhishek

RE: 51 factorial endedwith how many zeros?

one zero is made up of one five(5) and one two(2)

i.e 5x2=10.

in 51 factorial 5 occurs 12 times and 2 more than that

therefore combination of both will give 12 zeros.

50 = 5x5x2

45=5x9

40=5x8 35=7x5 30=6x5 25=5x5 20=5x4 15=5x3 10=5x2 5=5x1

in total 12 5's.

Is this answer useful? Yes | No

February 15, 2007 11:14:33

vinayprasad2006

Member Since: February 2007 Contribution: 1

RE: 51 factorial endedwith how many zeros?

The answer is 10 zeros.Explanation:To make a zero it requires a 5 and a 2 or a 10.from 1 to 10 we have a (5,2) and a 10 so multiplication of all would give 2 zeros.similarly from 11 to 20 another 2.so in total for 51! we have 10 zeros.

Is this answer useful? Yes | No

February 24, 2007 10:13:36

manish

RE: 51 factorial endedwith how many zeros?

    [ 51/5 ] +[51/5^2 ] +.....=12

    [51/2] +[51/2^2]+[51/2^3] +[51/2^4]+[51/2^5] +.........=47

      since there are 12 5's and 47 2's
      we can multiply 12 5's and 12 2's to get 10^12

thus we will have 12 0's at the end of 51!

Is this answer useful? Yes | No

Go To Top