Normally such questions involve just two groups with overlapping members. Here is a variety with three...
Questions 7-8: refer to the following information
In a marketing survey for products A, B, and C, 1,000 people were asked which of the products, if any, they use. The three circular regions in the diagram above represent the numbers of people who use products A, B, and C, according to the survey results. Of the people surveyed, a total of 400 use A, a total of 400 use B, and a total of 450 use C.
7. How many of the people surveyed use exactly one of the products?
8. What percent of the people surveyed use product A or product B or both, but not product C?
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