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<< Click to Display Table of Contents >> FACTDOUBLE (double factorial) |
Syntax:
FACTDOUBLE(Number)
Description:
Returns the double factorial of the specified 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.
Number must be ≥ 0. Digits to the right of the decimal point are ignored.
Example:
FACTDOUBLE(10) equals 2*4*6*8*10, which equals 3840.
FACTDOUBLE(11) equals 1*3*5*7*9*11, which equals 10395.
See also: