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# FACTDOUBLE

## Name

FACTDOUBLE --

## Synopsis

    FACTDOUBLE(number)

## Description

FACTDOUBLE function returns the double factorial of a @number.

If @number is not an integer, it is truncated. If @number is negative FACTDOUBLE returns #NUM! error. This function is Excel compatible.

## Examples

FACTDOUBLE(5) equals 15.

## See also

FACT.

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