Cody

Trial software

Problem 44067. The last non-zero digit of a factorial

Created by Jihye Sofia Seo

Solve Later

For given positive integer n, what is the last non-zero digit of n!?

Example: factorial(11) = 39916800

Last non-zero digit is 8.

Optional: Can you make an efficient algorithm for very large n?

Solve

Solution Stats

Last solution submitted on Feb 08, 2019

Last 200 Solutions

Problem Comments

Solution Comments

Solution 1124528

1 Comment

1 Comment

James on 16 Feb 2017

Need a better test suite to prevent cheesy solutions like this one. :-) Some N>10 values in there would help. N>50 would be even better.

Problem Recent Solvers13

Suggested Problems

Reverse the Words (not letters) of a String

239 Solvers
Back to basics 5 - Clipboard

262 Solvers
Back to basics 14 - Keywords

352 Solvers
Remove element(s) from cell array

96 Solvers
Perfect Square or not

187 Solvers

More from this Author9

Make a rainbow matrix (follow-up to checkerboard matrix)

28 Solvers
The number of trailing zero digit of a factorial

14 Solvers
Smallest n, for n! to have m trailing zero digits

12 Solvers
Number of even divisors of a given number

11 Solvers
Number of paths on a n-dimensional grid

7 Solvers

Problem Tags

factorial

Trial software