Which of these is a surd?

Which of these is a surd?
  1. $\sqrt{11}$
  2. $\sqrt{49}$
  3. $\sqrt{25}$
  4. $\sqrt{144}$

Solution

A surd is an irrational root of a rational number; $11$ is not a perfect square.

Asked in: MH-SSC-9

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