Question: 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

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: 302, PC World 290, PC Magazine 320, television 170, PC World and PC Magazine 131, PC Magazine and television 130, PC World and television 84, all three sources How many of the surveyed customers knowA 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:

302, PC World 290, PC Magazine 320, television 170, PC World and PC Magazine 131, PC Magazine and television 130, PC World and television 84, 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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