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Description: Returns the factorial of a number. The factorial of a number is equal to 1*2*3*...* number.
Syntax: FACT(Number)
Number is the nonnegative integer number you want the factorial of.
Example:
FACT(5) = 120 [Factorial of 5, or 1*2*3*4*5]
FACT(-1) = #VALUE! [negative numbers cause an error!]
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