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A survey of 60 customers was taken at a bookstore regarding the types of books purchased. The survey
found that 35 customers purchased mysteries, 28 purchased science fiction, 21 purchased romance
novels, 15 purchased mysteries and science fiction, 11 purchased mysteries and romance novels, 8
purchased science fiction and romance novels, and 4 purchased all three types of books.
a) How many of the customers surveyed purchased only mysteries?
b) How many purchased mysteries and science fiction, but not romance novels?
a) There were customers who purchased only mysteries.
(Simplify your answer.)
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