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7名志愿者中安排6人在周六.周日两天参加社区公益活动.若每天安排3人.则不同的安排方案共有
7名志愿者中安排6人在周六.周日两天参加社区公益活动.若每天安排3人.则不同的安排方案共有
发布时间:2021-02-22 09:46:11
7名志愿者中安排6人在周六、周日两天参加社区公益活动.若每天安排3人,则不同的安排方案共有
种(用数字作答).
网友回答
答案:
分析:
由题意知本题需要先从7人中任取6人,共有C76种不同的取法.再把6人分成两部分,每部分3人,最后排在周六和周日两天,有A22种排法,根据分步计数原理得到结果.
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