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在学习排列组合时,我们会遇到一些形形色色的小球进盒问题,在深刻把握两个计数原理的同时,对下述小球进盒的种种问题应有清醒的认识.
When learning to arrange and combine, we will encounter a variety of small ball into the box problem, in the deep grasp of the two counting principle at the same time, the following ball into the box of various problems should have a clear understanding.