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QIn a survey of 250 students, 90 were taking mathematics and 70 were taking psychology

In a survey of 250 students, 90 were taking mathematics and 70 were taking psychology. What is the greatest number of students who could have been taking both courses?

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#1DonaldAnswered at 2013-03-25 23:40:46
70 is the greatest number. If 71 were taking both, that exceeds the number taking psychology
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In a survey of 250 students, 90 were taking mathematics and 70 were taking psychology

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