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OpenStudy (anonymous):
200 small businesses answered a questionnaire about their use of computers. 150 use IBM, 100 use Apple, and 60 use both. a. How many use neither? b. How many use IBM or Apple but not both?
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OpenStudy (mathmale):
Hint: Try drawing a Venn Diagram. If 60 businesses use both brands, then the circles in the Venn Diagram representing Apple and IBM will overlap somewhat.
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