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A student claims that every non-terminating decimal is irrational. Which of the following numbers proves the student's claim wrong?

Answer and explanation

Correct answer: \(0.27272727\ldots\)

\(0.27272727\ldots\) is a non-terminating recurring decimal because the block 27 repeats indefinitely. Every recurring decimal is rational; in fact, \(0.272727\ldots=\frac{3}{11}\). Hence, it disproves the student's claim. In option B, the number of zeros keeps increasing, so there is no fixed repeating block and it is irrational. Exam tip: For a non-terminating decimal, check whether a repeating pattern exists before deciding if it is rational or irrational.

Related tags

Real NumbersRational NumbersIrrational NumbersRecurring DecimalsDecimal ExpansionNumber SystemsMathematicsClass 9 Mcq

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