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A student says, “If n is an integer, then \(\sqrt{n}\) will also be an integer.” Which example is most suitable to disprove this statement?

Answer and explanation

Correct answer: \(\sqrt{2}\) is irrational

Option C is a counterexample: 2 is an integer, but \(\sqrt{2}\) is neither an integer nor rational. If \(\sqrt{2}=p/q\), then \(p^2=2q^2\) makes both p and q even, a contradiction. Exam tip: one counterexample disproves a universal statement.

Related tags

Number SystemsIrrational NumbersSquare Root 2Proof By ContradictionCounterexampleProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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