There are 8 books in a shelf that consist of 2 paperback books and 6 hardback books. If 3 books are selected at random without replacement, how many different combinations are there that at least one paperback book is selected?
Options:
(A) 36
(B) 45
(C) 50
(D) 55
(E) 60 OK. Let's think. Some random thoughts first:
user
8C3 [Select any four] - 6C3 [Select all hard backs] = 36. The answer: (A).
assistant