例谈解排列组合问题──排除重复避免遗漏

About Permutation and Combination ──Exclude Repetition and Avoid Omission

本文谈解排列组合问题的常用方法：一，慎密审题；二．采用直观方法，化抽象为形象；三，利用知识间的内在联系；四，不改变原题的性质，改变题设条件辅助思考；五，一题多解．

In this article some methods of solving permutation and combinahon problems are given.1,Examine problems carefully. 2, Adopt direct-vision methods and change abstrachon intovisulization. 3, Make use of inner relations of knowledge. 4, Do not change the nature of the originalproblem but change the conditions given by the problem for helping one with consideration. 5, Solveone problem with many methods.Kcywrods: permutation combinatoon repetiion omission