FACTDOUBLE
Returns the double factorial of the specified number.
Syntax
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FACTDOUBLE( Integer x ) → Number |
The double factorial of a number is the product of every other integer numbers from 1 to the number itself. That is, if x is even, the double factorial of x is 2*4*6*…*x; if x is odd, the double factorial is 1*3*5*…*x. The double factorial of zero is, by definition, 1.
If x is not integer, it is automatically truncated. If x is less than zero, the function returns the #NUM! error value.
| Formula
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=FACTDOUBLE(0) |
Function Reference
FACT Function
