Combinations & Permutations
Calculate nPr and nCr values
公式
C(n,r) = n! / (r!(n-r)!)
Permutations = order matters; combinations = order doesn't matter.
示例
C(10,3)
120 combinations, 720 permutations.
常见问题
关于 Combinations & Permutations
Calculate combinations and permutations for probability problems.