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Why Do We Use Factorials? [Solved]
It’s very useful for when we’re trying to count how many different orders there are for things or how many different ways we can combine things. For example, how many different ways can we arrange n things? We have n choices for the first thing.
Factorial and counting seat arrangements | Probability and Statistics | Khan Academy
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Factorials
We have
Factorials Explained!
This precalculus video tutorial provides a basic introduction into
