FACTThe FACT function returns the factorial of a number.
value – The number or reference to a number whose factorial will be calculated and returned.
If a number or reference to a number with a decimal part is provided to FACT, the decimal part will be silently truncated before calculation.
MULTINOMIAL: Returns the factorial of the sum of values divided by the product of the values’ factorials.
FACTDOUBLE: Returns the “double factorial” of a number.
COMBIN: The COMBIN function returns the number of ways to choose some number of objects from a pool of a given size of objects.