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A group of 123 workers went to a canteen for cool drinks, ice - cream and tea, 42 workers took ice - cream , 36 tea and 30 cool drinks , 15 workers purchased ice cream and tea, 10 ice cream and cool drinks, 4 cool drinks and tea but not ice cream, 11 took iice cream and tea but not cool drinks. Number of workers that did not purchase anything is |
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Answer» 54 |
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