FACT function
FACT returns the factorial of a number. Factorials are calculated as 1*2*3*4* ... * .
Syntax
FACT(number)
FACT returns number!, the factorial of number.
=FACT(0) returns 1 by definition.
The factorial of a negative number returns the invalid argument error.
Example
=FACT(3) returns 6.
=FACT(0) returns 1.