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Returns the number of combinations of distinct k elements from among n elements, e.g., Combin(10,2)=45
Returns the factorial of n, e.g., Fact(5)=5!=120
Fact() of a negative number returns 0.
FactDouble(n)
Returns the product of all even (when n is even) or all odd (when n is odd) numbers between 1 and n, e.g., FactDouble(5)=15, FactDouble(6)=48
FactDouble() of a negative number returns 0.
Multinomial(n1,n2,...)
Factorial of sum of arguments, divided by the factorials of all arguments, e.g., Multinomial(2,5,3)=Fact(2+5+3)/(Fact(2)*Fact(5)*Fact(3)=10!/(2!*5!*3!)=2520
All arguments of Multinomial() have to be positive.