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Riya says that \(\sqrt{n}\) is irrational for every natural number n. Which of the following examples proves her statement wrong?

Answer and explanation

Correct answer: \(\sqrt{36}=6\)

Since \(\sqrt{36}=6=\frac{6}{1}\), it is rational, so Riya’s statement is false. \(2\), \(5\), and \(11\) are not perfect squares, so their square roots are irrational. Exam tip: check for perfect squares first.

Related tags

Irrational NumbersRational NumbersSquare RootsPerfect SquaresNumber SystemsMathematicsClass 9 Mcq

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