题目信息
There are 8 books on a shelf, of which 2 are paperbacks and 6 are hardbacks. How many possible selections of 4 books from this self include at least one paperback?
A:40
B:45
C:50
D:55
E:60
参考答案及共享解析

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已选答案:
正确答案:
D:55
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