FACTDOUBLE

This function calculates the double factorial of the specified number.

Syntax

FACTDOUBLE(number)

Arguments

The argument can be any non-negative numeric value.

Remarks

The number argument must be a non-negative number. If you provide a number that is not an integer for the number argument, the decimal portion of the number is ignored.

The double factorial is calculated as follows for even numbers:

n!! = n(n-2)(n-4) ... (4)(2)

The double factorial is calculated as follows for odd numbers:

n!! = n(n-2)(n-4) ... (3)(1)

Data Types

Accepts numeric data. Returns numeric data.

Examples

FACTDOUBLE(E3)

FACTDOUBLE(R3C5)

FACTDOUBLE(6) gives the result 48