Calculates the factorial[1] of a number.
Syntax:
FACT( number )
Returns the factorial of a number (commonly shortened to n!).
number must be an integer greater than or equal to zero.
Formula:
n! = i ∏1n i
i.e.
n! = n × (n − 1) … × 2 × 1
Revisions:
This function was added in 1.30.