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FACTDOUBLE function: Description, Usage, Syntax, Examples and Explanation

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What is FACTDOUBLE function in Excel?

FACTDOUBLE function is one of the Math and Trig functions in Microsoft Excel that returns the double factorial of a number.

Syntax of FACTDOUBLE function

FACTDOUBLE(number)

The FACTDOUBLE function syntax has the following arguments:

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

FACTDOUBLE formula explanation

  • 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 of FACTDOUBLE function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Formula Description Result
=FACTDOUBLE(6) Double factorial of 6. For 6, an even number, the double factorial is equivalent to 6*4*2; using this equation:

n!! = n*(n-2)*(n-4)…(4)(2)

48
=FACTDOUBLE(7) Double factorial of 7. For 7, an odd number, the double factorial is equivalent to 7*5*3; using this equation:

n!! = n*(n-2)*(n-4)…(3)(1)

105

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