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Omni-MATH / A class of 30 students was asked what they did on their winter holiday. 20…

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problem

A class of 30 students was asked what they did on their winter holiday. 20 students said that they went skating. 9 students said that they went skiing. Exactly 5 students said that they went skating and went skiing. How many students did not go skating and did not go skiing?

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