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A group of 123 workers went to a canteen...

A group of 123 workers went to a canteen for cold drinks, ice-cream and tea, 42 workers took ice-cream, 36 tea and 30 cold drinks. 15 workers purchased ice-cream and tea, 10 ice-cream and cold drinks, and 4 cold drinks and tea but not ice-cream, 11 took ice-cream and tea but not cold drinks. Determine how many workers did not purchase anything?

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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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