There are 8 books on a shelf, of which 2 are paperbacks and 6 are

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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、40.0
B、45.0
C、50.0
D、55.0
E、60.0

答案：D

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