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排列组合是中学数学教学 中的一个重要内容，也是学生 学习的难点。特别是可重复元 素的组合问题，在日常生活当 中经常接触的到，解决这类问 题需要较强的分析能力，要善 于从各种不同角度进行思考， 对符合题设条件的种种情况必 须正确分类，做到既不重复又 不遗漏。根据学生
Permutations and combinations are an important part of mathematics teaching in middle school and are also difficult for students to learn. In particular, the problem of the combination of repeatable elements is often encountered in daily life. Solving such problems requires strong analytical skills. It must be good at thinking from various perspectives. All situations that meet the conditions of the questions must be correctly classified. , do not repeat and not miss. According to students