# FACTDOUBLE

### Definition of FACTDOUBLE

Returns the "double factorial" of a number.

### Sample Usage

`FACTDOUBLE(6)`

`FACTDOUBLE(A2)`

### Syntax

`FACTDOUBLE(value)`

`value`

- The number or reference to a number whose double factorial will be calculated and returned.

### Notes

The double factorial is similar to the factorial, except instead of multiplying by each integer value less than or equal to the provided value, it decrements by 2. Thus the double factorial of 8 is 8

*6*4*2 and the double factorial of 7 is 7*5*3*1.If a number or reference to a number with a decimal part is provided to

`FACTDOUBLE`

, the decimal part will be silently truncated before calculation.

### See Also

`MULTINOMIAL`

: Returns the factorial of the sum of values divided by the product of the values' factorials.

`FACT`

: Returns the factorial of a number.

`COMBIN`

: Returns the number of ways to choose some number of objects from a pool of a given size of objects.

### In order to use the FACTDOUBLE formula, start with your edited Excellentable

### Then type in the FACTDOUBLE Formula in the area you would like to display the outcome:

### Type in the complete FACTDOUBLE formula for a cell as shown below:

### Excellentable will generate the outcome when hitting enter.