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

Version Available

This function is available in product version 1.0 or later.

See Also

FACT | PRODUCT | Math and Trigonometry Functions