A rational between $\dfrac{5}{7}$ and $\dfrac{6}{7}$ is

A rational between $\dfrac{5}{7}$ and $\dfrac{6}{7}$ is
  1. $\dfrac{11}{14}$
  2. $\dfrac{4}{7}$
  3. $\dfrac{1}{2}$
  4. $1$

Solution

$\dfrac{10}{14} < \dfrac{11}{14} < \dfrac{12}{14}$.

Asked in: IMO

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