解决排列、组合问题常用方法:两个原理、优限法、排除法、捆绑法(视一法)、插空法、隔板法、等可能法、固定模型、树图法等,但最基础的是“两个原理”.排列、组合问题大体分以下几个类型 Common methods to solve the problem of alignment and combination: two principles, the method of optimization, exclusion, binding method (as a method), interpolation method, spacer method, etc. possible method, fixed model, tree diagram method, but the most basic Is the “two principles ”. Arrangement, combination problems generally divided into the following types