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A factorial of a positive integer n, is the product of all positive integers less than or equal to n. For example the factorial of 5 is:

5! = 5 x 4 x 3 x 2 x 1 = 120

0! is a special case that is explicitly defined to be 1.

A factorial is denoted by n! (5! for this example)

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Q: What is a factorial of a number?
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