A computer company advertises its computers in PC World, in PC Magazine, and on television. A survey of 710 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: 306, PC World 230, PC Magazine 370, television 120, PC World and PC Magazine 134, PC Magazine and television 140, PC World and television 82, all three sources How many of the surveyed customers know about the computers because of EXACTLY ONE of these forms of advertising

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