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A student claims that every non-terminating decimal expansion is irrational. Which example proves the claim wrong?

Answer and explanation

Correct answer: \(0.272727\ldots\)

In \(0.272727\ldots\), the block 27 repeats, so it is recurring and \(27/99=3/11\); hence it is rational. \(\sqrt{2}\), \(\pi\), and \(0.1010010001\ldots\) are non-recurring. Exam tip: every recurring decimal is rational.

Related tags

Number SystemsDecimal RepresentationRecurring DecimalsRational NumbersIrrational NumbersMisconception AnalysisMathematicsClass 9 Mcq

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