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1 基本应用隔板法是插空法的一种特殊情况 ,能解决一大类组合问题 ,请看以下典型问题 :例 1 9个相同的小球放到 6个不同盒子里 ,每个盒子至少一个球 ,有多少种不同的放法 ?解析 法 1:先在盒子里各放一个球 ,再把剩下的 3个球放到 6个盒子里 ,分三类 :① 3个球放到一个盒子?
1 The basic application of the partition method is a special case of the Interpolation method. It solves a large group of problems. See the following typical problem: Example 1 9 identical balls are put into 6 different boxes, each box is at least How many different methods are there for a ball? Analytical method 1: First put a ball in the box, and then put the remaining 3 balls into 6 boxes, divided into three categories: 1 3 balls put into one box?