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Question: a computer company advertises its computers in pc world in...

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A computer company advertises its computers in PC World, in PC Magazine, and on television. A survey of 790 customers finds that the numbers of customers who are familiar with the company's computers because of the different forms of advertising are as follows:

304, PC World
270, PC Magazine
390, television
150, PC World and PC Magazine
137, PC Magazine and television
170, PC World and television
88, all three sources

How many of the surveyed customers know about the computers because of:

(a) exactly one of these forms of advertising?


(b) exactly two of these forms of advertising?


(c) PC World and neither of the other two forms of advertising?

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