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<div style="font-size:30px">'''FACTORIAL (Number)'''</div><br/>
*<math>Number</math> is any positive integer.
==Description==
*This function is showing the result of factorial of a number.
*Factorial means the result of multiplying a sequence of descending natural numbers down to 1.
*In <math>FACTORIAL (Number)</math>,<math>Number</math> is any positive integer.
*So the factorial <math>n!</math> is defined for a positive integer n as:
<math>n!=n(n-1)...2·1</math>.
*For example 4!=4*3*2*1 = 24.
*The given number will truncated to integer if the given number is in Decimal.
*This function will returns the result as NaN when the given number is in negative.
==Examples==
#FACTORIAL(9) = 362880
#FACTORIAL(4.3) = 24
#FACTORIAL(54) = 2.308436973392414e+71
#FACTORIAL(-3) = NaN
==See Also==
*[[Manuals/calci/FACTDOUBLE | FACTDOUBLE]]
==References==
*[http://en.wikipedia.org/wiki/Factorial Factorial]