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Excel

FACTDOUBLE is a function in Excel that calculates the double factorial of a number. The double factorial of a number is the product of all the integers from 1 to the number, multiplied by all the integers from 2 to the number minus 1. For example, the double factorial of 5 is 120. To use the FACTDOUBLE function in Excel, you first enter the number you want to calculate the double factorial of into a cell. Then you type "FACTDOUBLE" into another cell, and Excel will automatically calculate the double factorial of the number you entered.

The syntax of FACTDOUBLE in Excel is as follows:

=FACTDOUBLE(number)

Where number is the number of cells for which you want to calculate the factorial.

One example of how to use FACTDOUBLE in Excel is to find the product of two numbers. For instance, if you enter the numbers 5 and 8 into a spreadsheet cell, and then use the FACTDOUBLE function to calculate the product, the function will return 40. Another example of how to use the FACTDOUBLE function is to calculate the factorial of a number. For instance, if you enter the number 3 into a spreadsheet cell, and then use the FACTDOUBLE function to calculate the factorial, the function will return 6.

There are many instances in which you should not use FACTDOUBLE in Excel. One example is when you are trying to calculate the factorial of a number that is less than zero. In this case, Excel will return a value of #VALUE!

In Excel, there are a few similar formulae to FACTDOUBLE. FACTDOUBLE is a formula that calculates the factorial of a number that is doubled. The similar formulae are as follows:

FACTDOUBLE(number)

- FACT(number)

- PRODUCT(number,1)

- PRODUCT(number,number)

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