What must be added to $525$ to get the next perfect square?

What must be added to $525$ to get the next perfect square?
  1. $4$
  2. $25$
  3. $1$
  4. $5$

Solution

$22^{2} = 484$, $23^{2} = 529$. So $529 - 525 = 4$.

Asked in: IMO

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