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题目内容
On a bookshelf, Pat arranges 7 different books: 2 history books, 3 philosophy books, and 2 science books. If Pat arranges the books so that the history books are next to each other, the science books are next to each other, and the philosophy books are next to each other, how many different arrangements are possible?
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· 相关考点
6.3.5 特殊排列组合技巧
6.3.5 特殊排列组合技巧
以上解析由 考满分老师提供。