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排列组合是高中数学的重点和难点之一,也是进一步学习概率的基础.解答排列组合问题时,首先要认真审题,对问题的性质做出判断,明确其属于排列问题还是组合问题,或者属于排列与组合的混合问题;其次要抓住问题的本质特征,灵活运用基本原理和公式进行分析解答.无论是对问题进行宏观观察的过程,还是对问题的进行微观处理的过程,正确判断问题属性和明确区分完成某件事情的过程,都
Permutation and combination is one of the key and difficult points of high school mathematics, and it is also the basis for further study of probability. When arranging and arranging questions, we must first carefully examine questions, make judgments on the nature of the questions, and make clear whether they belong to the arrangement problem or the combination problem, or belong to the arrangement. The problem of mixing with the combination; secondly, we must grasp the essential characteristics of the problem, and use the basic principles and formulae to analyze and answer. Whether it is the process of macroscopic observation of the problem or the process of microscopic processing of the problem, the correct judgment of the problem attributes and Clearly distinguish the process of accomplishing something, all