关于排列的几种类型

On a Few Types of Alignment

排列组合内容抽象,富于技巧;它的思想方法也别具一格,知识间的联系,主要靠抽象思维来把握。它的解题技巧更是多种多样,灵活多变。有鉴于此,对排列问题进行详细分类,对于正确理解排列概念,进而准确进行排列数的计算是大有裨益的。列举了各种不同类型的排列,归纳总结了不同类型排列的计数公式。并通过典型例题的分析与解答,介绍解题的思想方法,给出解答各类题目的具体规律,并提供一些常用的解题技能和技巧。

The content of alignment is abstract and skillful; Its thought method is unique;The connection of the knowledge is mainly held by abstract thinking; Its solution technique is also varied and changeable. Owing to this, it is of great benefit to carry on the detailed classification towards aligning the problem, comprehend the alignment concept exactly, then accurately carry on calculation of aligning numbers . This paper illustrates the alignment of various different types, and concludes the count formula of different types of alignment. It intro- duces solutions to the problem by. analyzing the typital model, gives the concrete regulation of solving various problems, and provides some common solutions and techniques.