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Of the 130 students who took a mathematics exam, 52 correctly answered the first question, 62 correctly answered the second question, and 31 correctly answered

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Of the 130 students who took a mathematics exam, 52 correctly answered the first question, 62 correctly answered the second question, and 31 correctly answered both questions. How many students did not answer either of the two questions correctly? students did not answer either of the two questions correctly

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