$\dfrac{1}{1/x}$ equals (with $x \ne 0$)

$\dfrac{1}{1/x}$ equals (with $x \ne 0$)
  1. $x$
  2. $\dfrac{1}{x}$
  3. $x^{2}$
  4. $0$

Solution

Reciprocal of reciprocal is the original.

Asked in: IMO

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