$\dfrac{2}{3} \times \dfrac{5}{7} - \dfrac{1}{4}$ equals

$\dfrac{2}{3} \times \dfrac{5}{7} - \dfrac{1}{4}$ equals
  1. $\dfrac{19}{84}$
  2. $\dfrac{1}{4}$
  3. $\dfrac{10}{21}$
  4. $\dfrac{1}{84}$

Solution

$\dfrac{10}{21} - \dfrac{1}{4} = \dfrac{40-21}{84} = \dfrac{19}{84}$.

Asked in: IMO

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