I remember reading this excellent little book with very easy to understand explanations of some of the basics re. permutations and combinations, back in school:
"Mathematics of Choice: How to Count Without Counting" by Ivan Morton Niven
Why do we need this? What's wrong with good old "there are n ways to pick first element, n-1 ways to pick second, etc and then apply burnside to glue together things that we treat as identical"?
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[ 2.5 ms ] story [ 21.0 ms ] thread"Mathematics of Choice: How to Count Without Counting" by Ivan Morton Niven
https://www.amazon.com/Mathematics-Choice-New-Mathematical-L...