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12名同学合影.站成前排4人后排8人.现摄影师要从后排8人中抽2人调整到前排.若其他人的相
12名同学合影.站成前排4人后排8人.现摄影师要从后排8人中抽2人调整到前排.若其他人的相
发布时间:2021-02-22 09:46:37
12、12名同学合影,站成前排4人后排8人,现摄影师要从后排8人中抽2人调整到前排,若其他人的相对顺序不变,则不同调整方法的总数是( )
A、C82A32
B、C82A66
C、C82A62
D、C82A52
网友回答
答案:
分析:
从后排8人中选2人共C82种选法,这2人插入前排4人中且保证前排人的顺序不变,则先从4人中的5个空挡插入一人,有5种插法;余下的一人则要插入前排5人的空挡,有6种插法为A62.
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