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Formula Functions / Functions D to G / FACTDOUBLE
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    FACTDOUBLE
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    This function calculates the double factorial of the specified number.

    Syntax

    FACTDOUBLE(number)

    Arguments

    The argument can be any non-negative numeric value.

    Remarks

    The number argument must be a non-negative number. If you provide a number that is not an integer for the number argument, the decimal portion of the number is ignored. The double factorial is calculated as follows for even numbers:

       n!! = n(n-2)(n-4) ... (4)(2)

    The double factorial is calculated as follows for odd numbers:

       n!! = n(n-2)(n-4) ... (3)(1)

    Data Types

    Accepts numeric data. Returns numeric data.

    Examples

    FACTDOUBLE(E3)

    FACTDOUBLE(R3C5)

    FACTDOUBLE(6) gives the result 48

    Version Available

    This function is available in product version 1.0 or later.

    See Also

    FACT | PRODUCT | Math and Trigonometry Functions