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排列、组合都是研究事物在某种给定的模式下所有可能的配置的数目问题,它们之间的主要区别在于是否要考虑选出元素的先后顺序,不需要考虑顺序的是组合问题,需要考虑顺序的是排列问题,排
Arrangement and combination are the problems of studying the number of all possible configurations of a given model under a given pattern. The main difference between them is whether to consider the order of the selected elements. It is not necessary to consider whether the order is a combination problem. Considering the order is the arrangement problem, row