# Last non zero digit of $n!$ [duplicate]

What is the last non zero digit of $100!$?

Is there a method to do the same for $n!$?

All I know is that we can find the number of zeroes at the end using a certain formula.However I guess that's of no use over here.

• See here for a general formula. Or just do a search for "last non zero digit of n!" in this site, or look at the related links in to the right. – Calvin Lin May 18 '13 at 17:14