The Excel FACT function returns the factorial of a given number. For example, =FACT(3) returns 6, equivalent to 3 x 2 x 1.
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.
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...
The Excel FACTDOUBLE function returns the double factorial of a number. A double factorial is symbolized by two exclamation marks (!!).
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