The Excel FACTDOUBLE Function

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Related Function :

FACT Function

Factorial

The Double Factorial of a number, N, is given by the following :

If N is even :

N * (N-2) * (N-4) * ... * 4 * 2

If N is odd :

N * (N-2) * (N-4) * ... * 3 * 1

More information can be found on the Wikipedia Factorial page

Basic Description

The Excel FACTDOUBLE function returns the double factorial of a supplied number

The format of the function is :

FACTDOUBLE( number )

where the number argument is the positive integer that you want to calculate the double factorial of.

Examples

Cells A1-A3 of the following spreadsheet shows examples of the Excel Factdouble function being used to calculate the double factorial of different integers. The format of the functions is shown in the spreadsheet on the left and the results are shown in the spreadsheet on the right.

Formulas: