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Description: Returns the double factorial of a number.
Syntax: FACTDOUBLE(Number)
Number is the value for which to return the double factorial. If Number is not an integer, it is truncated.
Remarks:
Number must be numerical.
Number must be nonnegative.
If Number is even:
If number is odd:
Example:
FACTDOUBLE(6) = 48 [double factorial of 6]
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