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(a)A merchant surveyed 400 people to determine the way they learned about an upcoming sale. The survey showed that 180 learned about the sale from

(a)A merchant surveyed 400 people to determine the way they learned about an upcoming sale. The survey showed that 180 learned about the sale from the radio, 190 from television, 190 from newspaper, 80 from radio and television, 90 from radio and newspapers, 50 from television and newspapers, and 30 from all three sources. How many people learned of the sale from radio and newspaper but not from television?

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