FACTDOUBLE function

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:

Equation

  • If number is odd:

Equation

Example

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

ShowHow 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

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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Formula Description (Result)
=FACTDOUBLE(6) Double factorial of 6 (48)
=FACTDOUBLE(7) Double factorial of 7 (105)
 
 
Applies to:
Excel 2007