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在排列组合的教学中,“乘法原理”贯穿始终,起着最基本的作用。现行教科书中对乘法原理的叙述如下: 做一件事,完成它需要分成n个步
In the teaching of permutation and combination, the “multiplication principle” runs through and plays the most basic role. The current textbook describes the principle of multiplication as follows: To do one thing, it needs to be divided into n steps to complete it.