Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
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.
This question gets asked fairly frequently. There was originally a problem on the AMC asking for the last two digits. Here is my post on the single digit case, which is not all that much simpler than the two digit case.