Why 0!=1? How about (-1)! = ? Reddit r/learnmath, zero factorial vs negative factorial
We will discuss why 0 factorial is equal to 1, i.e. 0!=1. In fact, once you see the pattern, you will see it immediately. This question is from Reddit r/learnmath.
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#math #algebra #mathtutorials
0:00 Zero factorial, why 0!=1
3:17 How about (-1)! = ?
4:29 Meaning of factorial and why we need it