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Excel FACT Function

Excel FACT function
Summary 

The Excel FACT function returns the factorial of a given number. For example, =FACT(3) returns 6, equivalent to 3 x 2 x 1.

Purpose 
Find the factorial of a number
Return value 
The factorial of a number
Syntax 
=FACT (number)
Arguments 
  • number - The number to get the factorial of.
Usage notes 
  • The number cannot be negative or FACT will return the #NUM error.
  • If the number is not an integer it will be truncated to an integer, then solved.
Related functions 
Excel COMBIN function
Excel COMBIN Function

The Excel COMBIN function returns the number of combinations (in any order) of a given number of items. To use COMBIN, specify the total number of items and the number of items in each combination.

Excel PERMUT function
Excel PERMUT Function

The Excel PERMUT function returns the number of permutations (combinations where order is significant) of a given number of items. To use PERMUT, specify the total number of items and "number chosen", which represents the number of items in each...

Excel FACTDOUBLE function
Excel FACTDOUBLE Function

The Excel FACTDOUBLE function returns the double factorial of a number. A double factorial is symbolized by two exclamation marks (!!).

Good links 
Microsoft FACT function documentation

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