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A student says that every non-terminating decimal number is irrational. Which of the following numbers shows the error in this statement?

Answer and explanation

Correct answer: \(0.\overline{3}\)

\(0.\overline{3}=1/3\), so it is non-terminating but repeating and hence rational. In contrast, \(\sqrt{2}\) and \(\pi\) are irrational. Exam tip: a non-terminating repeating decimal is always rational.

Related tags

Irrational NumbersRational NumbersRecurring DecimalsDecimal ExpansionNumber SystemsMisconceptionsMathematicsClass 9 Mcq

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