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7名同学中按排6人在周六到两个社区参加社会实践活动.若每个社区不得少于2人.则不同的按排方
7名同学中按排6人在周六到两个社区参加社会实践活动.若每个社区不得少于2人.则不同的按排方
发布时间:2021-02-22 09:46:29
14、7名同学中按排6人在周六到两个社区参加社会实践活动,若每个社区不得少于2人,则不同的按排方法共有350
种(用数字作答)
网友回答
答案:
分析:
本题是一个分步和分类计数问题,首先从7个人中选6个,有C76种结果,要求每个社区不得少于2人,包括三种安排方法,即2,4,;3,3;4,2,分别表示出结果数,根据计数原理得到结果.
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