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题目内容双击单词支持查询和收藏哦～
A reading list for a humanities course consists of 10 books, of which 4 are biographies and the rest are novels. Each student is required to read a selection of 4 books form the list, including 2 or more biographies. How many selections of 4 books satisfy the requirements?
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6.3.5 组合
6.3.5 组合
以上解析由 考满分老师提供。
