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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 x (n - 1) x (n - 2) ... 3 x 2 x 1
For example, 5! = 5 x 4 x 3 x 2 x 1 = 120
Here are some facts about the factorial:
Enrichment task
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