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来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/07/13 15:39:24
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suppose there are four families each with parents and son.they are to be seated in a row of 12 seats from left to right.how many different ways can they be seated,if each family is to be seated together.
就是说 4个家庭 每个家庭是3个人 父母和儿子.现在有12个座位 从左到右排列 如果他们全部是一家人一起 有多少个坐法!
suppose there are four families each with parents and son.they are to be seated in a row of 12 seats from left to right.how many different ways can they be seated,if each family is to be seated together.
就是说 4个家庭 每个家庭是3个人 父母和儿子.现在有12个座位 从左到右排列 如果他们全部是一家人一起 有多少个坐法!
4!*3!*3!*3!*3!
再问： 求解释.......... 答案对了 但我不懂 为啥不是4P4这样选 先选4个家庭排列方法
再问： 求解释.......... 答案对了 但我不懂 为啥不是4P4这样选 先选4个家庭排列方法