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Mathematics, 02.08.2019 09:30 Lizzy527663
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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