How many students answered the second question correctly, but not the first? The results from an exam

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How many students answered the second question correctly, but not the first?
The results from an exam taken by 150 students were as follows:
90 students correctly answered the first question,
71 students correctly answered the second question,
66 students correctly answered both questions.
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Finite Mathematics and Its Applications

ISBN: 978-0134768632

12th edition

Authors: Larry J. Goldstein, David I. Schneider, Martha J. Siegel, Steven Hair

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