permutation
Calculate permutations P(n,r) to determine the number of ways to arrange r items from n distinct elements. Use this tool for combinatorial mathematics problems involving ordered selections.
Instructions
计算从n个元素中选择r个元素的排列数 P(n,r)
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| n | Yes | ||
| r | Yes |