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一道排列组合题急在线等

2025-01-07 12:57:08

推荐回答（2个）

回答1：

用插空法。先排4名同学，有A44种排法，再把两名老师插入4名同学形成的5个空位中，有A52种插法，所以共有A44*A52种排法

回答2：

上面的方法是对的。
也可以反过来想，两名老师要么相邻要么不相邻，它们是互为对立事件。全排列减去相邻的就是不相邻的。式子是：A66-2*A55=480

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