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7.1.15 FACTORIAL
The FACTORIAL function returns an integer that is the factorial of the argument specified.
The function type is integer. 



    ___ Format _____________________________________________________________ 
   |                                                                        |
   | >>__FUNCTION FACTORIAL__(argument-1)________________________________>< |
   |                                                                        |
   |________________________________________________________________________|
argument-1
Must be an integer greater than or equal to zero and less than or equal to 28.
If the value of argument-1 is zero, the value 1 is returned; otherwise, its factorial is returned.

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