众所周知 ,排列组合的应用问题是高中数学的难点之一 ;众多的中学数学报刊都曾介绍过求解排列组合应用题的一些方法和技巧 ,但要使学生能运用这些方法和技巧去解决一些实际问题 ,也不是一件容易的事 ;若能找到一个问题的载体 ,使一些常用的思想方法、解题技巧等都包容其中 ,做? As we all know, the application of permutations and combinations is one of the difficulties of high school mathematics; many journals of middle school numbers have introduced some methods and techniques for solving permutations and combinatorial problems, but students should be able to use these methods and techniques to solve some practical problems. It is not an easy task; if you can find a carrier for a problem, make it possible to use some commonly used methods of thinking and solving problems and so on.