解排列组合问题主要是以分类计数原理和分步计数原理为基础,结合集合、映射等知识,建立适当的模型,将复杂问题转化为若干较易解决的类或步,利用容斥原理,防止重复或遗漏,从而使问题得解,本文以2004年高考题为例,构造几种模型巧妙解决排列组合问题.一、分类模型分类计数原理实际 The problem of unmarshalling and combination is based on the principle of classification and counting and the principle of step-by-step counting. Based on the knowledge of sets and mappings, an appropriate model is established, and the complex problems are converted into several more easily solved classes or steps. The principle of exclusion is used to prevent Repeat or omission, so as to solve the problem, this article to the 2004 college entrance examination questions as an example, the construction of several models cleverly solve the problem of permutation and combination. First, classification model classification principle of the actual