FACTDOUBLE

Returns the double factorial of a number.

Syntax

FACTDOUBLE(number)

Number is the value for which to return the double factorial. If number is not an integer, it is truncated.

Remarks

• If number is nonnumeric, FACTDOUBLE returns the #VALUE! error value.
• If number is negative, FACTDOUBLE returns the #NUM! error value.
• If number is even:

  

• If number is odd:

  

Example

The example may be easier to understand if you copy it to a blank worksheet.

How to copy an example

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

   Note Do not select the row or column headers.

   Selecting an example from Help

3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

See also:

• FACT
• Math and trigonometry functions
• MULTINOMIAL