$\sqrt{25 + 144}$ equals

$\sqrt{25 + 144}$ equals
  1. $13$
  2. $17$
  3. $169$
  4. $12$

Solution

$25 + 144 = 169$, $\sqrt{169} = 13$. (Note: $\sqrt{a + b} \neq \sqrt{a} + \sqrt{b}$ in general.)

Asked in: IMO

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