Calculate the double factorial of a number.

`=FACTDOUBLE(number)`

- number - The value for which to return the double factorial

`=FACTDOUBLE(6)`

The FACTDOUBLE function calculates the double factorial of a number. The double factorial is defined as the product of all integers from 1 up to the number, but counting in increments of 2. For example,the function returns 48. This is because 6*4*2*1 = 48.

`=FACTDOUBLE(7)`

The FACTDOUBLE function can be used to calculate odd double factorials as well. This example returns 105. This is because 7*5*3*1 = 105.

The FACTDOUBLE function calculates the double factorial of a number, which is the product of all the integers from 1 up to the given number, in steps of two.

- The FACTDOUBLE function takes one argument, which should be a positive integer.
- The argument is written as number, and the output of the function is written as !!.

The FACTDOUBLE function returns the double factorial of a number.

The FACTDOUBLE function returns the #VALUE! error if the number argument is not an integer.

The FACTDOUBLE function returns the #NUM! error if the number argument is negative.

The FACTDOUBLE function returns the #NUM! error if the number argument is odd.

Drop CSV