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At break, 123 students go to the school ...

At break, 123 students go to the school canteen, which sells cokes, ice-creams, and pizzas. Of the total, 42 students buy ice-cream, 36 buy pizza, 10 buy only coke. 15 students buy ice-cream and pizza, 10 buy ice-cream and coke, 4 buy cokes and pizza, but not ice-cream and 11 buy ice-cream and pizza, but not coke. Draw a Venn diagram and find out
How many students buy nothing at all?

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