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Of the 168 168 students who took a mathematicsexam, 99 99 correctly answered the firstquestion, 89 89 correctly answered the secondquestion, and 49 49 correctly

Of the 168

168 students who took a mathematicsexam, 99

99 correctly answered the firstquestion, 89

89 correctly answered the secondquestion, and 49

49 correctly answered both questions. How many students did not answer either of the two questionscorrectly?

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