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90 students: 31 take math, 28 take chemistry, 42 take psychology, 9 take math and chemistry, 10 take chemistry and psychology, 6 take math and
90 students: 31 take math, 28 take chemistry, 42 take psychology, 9 take math and chemistry, 10 take chemistry and psychology, 6 take math and psychology, 4 take all three subjects, and 20 take none of the three subjects
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