There are 8 books in a shelf that consist of 1 paperback books and 7 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?\nOptions:\n(A) 35\n(B) 45\n(C) 50\n(D) 55\n(E) 60 Think first, then make a decision. Some random thoughts:
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8C4 [Select any four] - 7C4 [Select all hard backs] = 35. So the answer is (A).
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