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Factotial

The factorial function (symbol: !) says to multiply all whole numbers from our chosen number down to 1.

Note: Zero factorial or 0! is equal to 1.

Examples:

4! = 4 * 3 * 2 * 1 = 24

7! = 7 * 6 * 5 * 4 * 3 * 2 * 1 = 5040

1! = 1

Factotial Options:

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