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Update combination.md
author
Xiaobin Ren
<xbren@bupt.edu.cn>
Thu, 5 Nov 2020 13:06:19 +0000
(21:06 +0800)
committer
GitHub
<noreply@github.com>
Thu, 5 Nov 2020 13:06:19 +0000
(21:06 +0800)
docs/math/combination.md
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$$
### 不相邻的排列
- $1 \sim n$ 这 $n$ 个自然数中选 $k$ 个,这 $k$ 个数中任何两个数
不相邻数
的组合有 $\displaystyle \binom {n-k+1}{k}$ 种。
+ $1 \sim n$ 这 $n$ 个自然数中选 $k$ 个,这 $k$ 个数中任何两个数
都不相邻
的组合有 $\displaystyle \binom {n-k+1}{k}$ 种。
### 错位排列