Returns the factorial of a number.
Factorial ( index )
| index | A numeric value. The fractional part of index is ignored. |
Factorial(5) returns 120 (which is 5 * 4 * 3 * 2 * 1).
Factorial(3.5) returns 6 (which is 3 * 2 * 1). The fractional part of index is ignored.
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