Permutation & Combination Calculator
P(n,r) Permutations • C(n,r) Combinations • Factorials • Pascal's triangle
P(n,r) = n! / (n−r)! — Ordered arrangements
P(n, r) = n! / (n−r)!
Examples:
C(n,r) = n! / (r! × (n−r)!) — Unordered selections
C(n, r) = n! / (r! × (n−r)!)
Examples:
Calculate n! = n × (n−1) × (n−2) × ... × 1
Pascal's Triangle — C(n,r) values