|
<< Click to Display Table of Contents >> FACTDOUBLE (double factorial) |
Syntax:
FACTDOUBLE(Number)
Description:
This returns the double factorial of a Number.
The double factorial is calculated as follows:
If Number is even, its double factorial is 2*4*6*...*Number.
If Number is odd, its double factorial is 1*3*5*...*Number.
The given number must be ≥ 0. Decimal places are automatically truncated.
Example:
FACTDOUBLE(10) equals 2*4*6*8*10, which is 3840
FACTDOUBLE(11) equals 1*3*5*7*9*11, which is 10395
See also: