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A Fun Twist on a Familiar Problem
We find the last nonzero digit of 75! written in base 10. Our approach can be generalised to finding the last nonzero 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
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