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15 May, 23:23

In a survey of computer users, it was found that 50 use hp printers, 30 use ibm printers, 20 use apple printers, 13 use hp and ibm, 9 use hp and apple, 7 use ibm and apple, and 3 use all three. how many use at least one of these brands?

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  1. 16 May, 01:54
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    The answer is 50+30+20-13-9-7+3=74
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