There are 8 books on a shelf that consist of 2 paperback books and 6 hardback books. If 4 books are selected at random

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B

C

D

E

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There are 8 books on a shelf that consist of 2 paperback books and 6 hardback books. If 4 books are selected at random without replacement, how many different combinations are there that at least one paperback book is selected?

A. 40
B. 45
C. 50
D. 55
E. 60

Answer: D

Source: GMAT Prep