1.

\(\dfrac{2}{3}, \dfrac{4}{7}, ?, \dfrac{11}{21}, \dfrac{16}{31}\)

A. \(\dfrac{5}{9}\)
B. \(\dfrac{6}{11}\)
C. \(\dfrac{7}{13}\)
D. \(\dfrac{9}{11}\)
Answer» D. \(\dfrac{9}{11}\)


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