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Al, Ben, Carl, Dina, and Edna are to be seated in a row of 5 adjoining chairs, with 1 person sitting in each chair. If Dina and Edna must each be seated in the first chair in the row or the last chair in the row, in how many different seating arrangements can the 5 people be seated?
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· 相关考点
6.3.4 排列
6.3.4 排列
以上解析由 考满分老师提供。
