The FACTDOUBLE function returns the double factorial of a number.

FACTDOUBLE takes 1 required argument and no optional arguments:

Syntax: FACTDOUBLE(number)

#1)
Using the FACTDOUBLE function:
#2)
The arguments for the FACTDOUBLE function are:
Argument Required? Description
number Required The value for which to return the double factorial. If number is not an integer, it is truncated.
#3)
A couple things:
If number is nonnumeric, FACTDOUBLE returns the #VALUE! error value.
If number is negative, FACTDOUBLE returns the #NUM! error value.

Summary

The FACTDOUBLE function returns the double factorial of a number.
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