Рет қаралды 8,004
We find the last non-zero digit of 75! written in base 10. Our approach can be generalised to finding the last non-zero digit of any factorial.
00:00 Intro
00:21 Prime factorisation
01:58 Modular arithmetic
05:06 Removing 15!
06:51 Including 2^18
07:57 Determining the last digit