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A student claims that every non-terminating decimal expansion is irrational. Which of the following numbers is a counterexample to the claim?

Answer and explanation

Correct answer: \(0.272727\ldots\)

\(0.272727\ldots\) is non-terminating but repeats 27, so it is rational. If \(x=0.272727\ldots\), then \(100x-x=27\), giving \(x=3/11\). Exam tip: only non-terminating, non-repeating decimals are irrational.

Related tags

Irrational NumbersRecurring DecimalsRational NumbersNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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