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:
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example
- Create a blank workbook or worksheet.
- Select the example in the Help topic.
Note Do not select the row or column headers.
Selecting an example from Help
- Press CTRL+C.
- In the worksheet, select cell A1, and press CTRL+V.
- 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.
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| A |
B |
| Formula |
Description (Result) |
| =FACTDOUBLE(6) |
Double factorial of 6 (48) |
| =FACTDOUBLE(7) |
Double factorial of 7 (105) |
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