Recursive Factorial
A recursive definition of the factorial function is arrived at by observing the following algebraic relationship:
For example, 5! is clearly equal to 5 * 4! as is shown by the following:
5! = 5 · 4 · 3 · 2 · 1
5! = 5 · (4 · 3 · 2 · 1)
5! = 5 · (4!)
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