The FACTDOUBLE function in Microsoft Excel is a math and trigonometry function that calculates the double factorial of a number.

The double factorial of a number is the product of all the integers from 1 up to the number, but only counting every other number. For example, the double factorial of 6 is 6 x 4 x 2, or 48.

Here’s a step-by-step guide on how to use the FACTDOUBLE function:

- Open your Microsoft Excel spreadsheet and select the cell where you want to display the result.
- Type the following formula into the selected cell: =FACTDOUBLE(number)
- Replace “number” with the cell reference or value for which you want to calculate the double factorial.

For example, if you want to calculate the double factorial of the value in cell A1, the formula would be: =FACTDOUBLE(A1)

- Press Enter to complete the formula and display the result.

Note: The FACTDOUBLE function only works with non-negative integers. If you try to use the function with a decimal or negative number, it will return the #NUM! error.

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