Advertising An advertising agency conducted a survey of 50 retail outlets and the following data were collected: 24 merchants advertised on radio; 20 merchants advertised on television, and 27 merchants advertised in the newspapers. Eleven merchants advertised on radio and television, 10 merchants advertised on television and in the newspapers, and 9 merchants advertised on radio and in the newspapers. Five merchants advertised through all three media.
a. How many merchants advertised only on television?
b. How many merchants did not use any of these media?
c. How many merchants advertised on radio or television?
d. How many merchants advertised on radio and television, but not in the newspapers?
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