Combination & Permutation Calculator
Calculate nCr and nPr
公式
C(n,r) = n! / (r!(n-r)!), P(n,r) = n! / (n-r)!
Combinations ignore order; permutations consider order.
示例
C(10,3)
= 120 combinations, 720 permutations.
常见问题
关于 Combination & Permutation
Calculate combinations and permutations.