Discrete Mathematics quiz

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In a group, 37 people study mathematics, 54 study computing and 32 study both. How many study at least one of the two?
In a group, 36 people study mathematics, 46 study computing and 33 study both. How many study at least one of the two?
In a group, 17 people study mathematics, 42 study computing and 7 study both. How many study at least one of the two?

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