Reciprocal of $-\dfrac{7}{3}$ is

Reciprocal of $-\dfrac{7}{3}$ is
  1. $-\dfrac{3}{7}$
  2. $\dfrac{3}{7}$
  3. $\dfrac{7}{3}$
  4. $\dfrac{1}{7}$

Solution

Reciprocal preserves sign.

Asked in: IMO

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