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1.你记得解排列组合问题的依据吗?提醒分类相加,分步相乘,有序排列,无序组合.(1)分类计数原理:N=m1+m2+…+m(nmi为各类办法中的方法数).
1. Do you remember to arrange the basis for the combination of the problem? Remind classification add, step by step multiplication, orderly arrangement, disorderly combination. (1) Classification and counting principle: N = m1 + m2 + ... + m The number of methods in the method).