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4. \( \frac{1}{2} + \left (\frac{2}{3} \div \frac{3}{4}\right ) - \left (\frac{4}{5} \times \frac{5}{6}\right )= \) ?
A. \( \frac{1}{16} \)
B. \( \frac{17}{27} \)
C. \( \frac{13}{18} \)
D. \( \frac{7}{9} \)
E. \( \frac{5}{6} \)
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Answer: C