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Of the 168 />168 students who took a mathematics​ exam, 99 99 correctly answered

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Question

Of the 168 />168 students who took a mathematics​ exam, 99
99 correctly answered the first​ question, 89
89 correctly answered the second​ question, and 49
49 correctly answered both questions. How many students did not answer either of the two questions​ correctly?

 
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