, 21.06.2019 19:00 ale1910

# Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries​, 25 purchased science fiction​, 18 purchased romance novels​, 12 purchased mysteries and science fiction​, 9 purchased mysteries and romance novels​, 6 purchased science fiction and romance novels​, and 2 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​? ​c) how many purchased mysteries or science fiction​? ​d) how many purchased mysteries or science fiction​, but not romance novels​? ​e) how many purchased exactly two types of​ books?

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