The FACTDOUBLE function returns the double factorial of a number.
Formula:
=FACTDOUBLE(number)
Explanations:
The number is required, which is the value that returns the double factorial.
Cautions:
If number is even, FACTDOUBLE equation: n!! = n(n-2)(n-4)…(4)(2).
If number is odd, FACTDOUBLE equation: n!! = n(n-2)(n-4)…(3)(1).
