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Concept explainers
Music preferences A campus radio station surveyed 190 students to determine the genres of music they liked. The survey results follow:
114 like rock
50 like country
15 like rock and rap
11 like rap and country
20 like rap only
10 like rock and rap, but not country
9 like rock and country, but not rap
20 don’t like any of the three types of music.
Exercises 61–68 refer to the students in this survey.
How many students like rock only?
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