FACT takes just oneargument,number, which should be a positive integer.
Ifnumberis not an integer, the decimal portion ofnumberwill be removed before the factorial is calculated.
The COMBIN functiondoes notallow repetitions.
To count combinations thatallowrepetitions, use theCOMBINA function.
The PERMUT functiondoes notallow repetitions.
A double factorial is symbolized by two exclamation marks (!
!
