nPr = n! / (n − r)!
Permutation calculates arrangements where order matters.
nCr = n! / (r! (n − r)!)
Combination calculates selections where order does not matter.
Permutation refers to arranging objects where order matters. For example, arranging students in different positions.
Combination refers to selecting objects without considering order. For example, choosing a team from a group.
nPr represents permutations where order of selection matters.
nCr represents combinations where order does not matter.