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Consumer surveys in a survey of 120 consumers conducted in


Question: CONSUMER SURVEYS In a survey of 120 consumers conducted in a shopping mall, 80 consumers indicated that they buy brand A of a certain product, 68 buy brand B, and 42 buy both brands. How many consumers participating in the survey buy

a. At least one of these brands?

b. Exactly one of these brands?

c. Only brand A?

d. None of these brands?

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Mathematics: Consumer surveys in a survey of 120 consumers conducted in
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