题目信息
There are 10 books on a shelf, of which 4 are paperbacks and 6 are hardbacks. How many possible selections of 5 books from the shelf contain at least one paperback and at least one hardback?
A:75
B:120
C:210
D:246
E:252
参考答案及共享解析

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已选答案:
正确答案:
D:246
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