排列、组合是学习概率、统计的基础知识,它与日常生活有着紧密的联系,学习本节内容对培养学生的逻辑思维能力有着重要的作用。对于排列、组合应用问题进行合理地分类分步 Arrangement and combination are the basic knowledge of learning probability and statistics. It has a close connection with daily life. Learning the contents of this section plays an important role in cultivating students’ logical thinking ability. Classifying and arranging applications in a well-defined way