How it works
nCr = n! ÷ (r!(n−r)!) when order doesn't matter; nPr = n! ÷ (n−r)! when it does.
Combination & Permutation Calculator
Count the ways to choose or arrange r items from n.
Your details
Combinations nCr
120
Permutations nPr
720
Count the ways to choose or arrange r items from n.
nCr = n! ÷ (r!(n−r)!) when order doesn't matter; nPr = n! ÷ (n−r)! when it does.