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The factorial of a number $n,$ written $n!,$ is the product of $n$ along with all the natural numbers smaller than $n$ (not including zero !!!).
Therefore, $n!=n \times(n1)\times(n2)\ldots3\times2\times1$
For example, 5! = 5 x 4 x 3 x 2 x 1 = 120
Here are some facts about the factorial:

Enrichment tasks:
(none)  (none)  BanachTarskiParadox BinomialCoefficient BinomialTheorem 

ZeroFactorial  BirthdayProblem MathematicsTaxonomy PascalsTriangle Permutation 

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