Counting Methods — Stapplet

Counting Methods

n = r =

Operation	Formula	Result
n factorial	10!	3,628,800
r factorial	3!	6
Permutations	₁₀P₃ = 10! / (10−3)!	720
Combinations	₁₀C₃ = 10! / (3! · (10−3)!)	120