用母函数求几类概率的方法

Application of Generation Function in Solving Possibilities

用母函数的方法可以使一些复杂的概率的求法得以简化，本文系统介绍了母函数在这方面应用，并且对其可解问题进行了分类，使之具有较强的可操作性的实用价值。

Generation Function is a very important tool to simplify the complex possibility solutions. This article introduces this usage of generation function, dividing the problems into different kinds to make them easier to solve.