A rational between $0$ and $\dfrac{1}{10}$ is

A rational between $0$ and $\dfrac{1}{10}$ is
  1. $\dfrac{1}{20}$
  2. $\dfrac{1}{5}$
  3. $\dfrac{2}{10}$
  4. $1$

Solution

$0 < 1/20 < 1/10$.

Asked in: IMO

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