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排列组合是一类思考方式较为独特的问题,它对分析能力的要求较高,解法也较为灵活,因此,也容易出错.下面谈谈三个方面的问题.
Permutation and combination is a kind of problem with a relatively unique way of thinking. It has a higher requirement for analysis ability and a more flexible solution method. Therefore, it is also easy to make mistakes. Here are three issues.