Mean of $\dfrac{1}{4}$ and $\dfrac{1}{6}$ is

Mean of $\dfrac{1}{4}$ and $\dfrac{1}{6}$ is
  1. $\dfrac{5}{24}$
  2. $\dfrac{2}{10}$
  3. $\dfrac{1}{5}$
  4. $\dfrac{1}{2}$

Solution

$\dfrac{1}{2}\cdot\dfrac{5}{12} = \dfrac{5}{24}$.

Asked in: IMO

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