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Riya claims that \(0.101001000100001\ldots\) is rational because only the digits 0 and 1 occur in it. Which is the correct refutation of her claim?

Answer and explanation

Correct answer: The number of zeros between successive 1s keeps increasing; therefore, the decimal is non-recurring.

Option A is correct. The 1s occur at positions 1, 3, 6, 10, …, so the zero-gaps 1, 2, 3, … keep growing and no fixed block repeats. B is false because using two digits does not ensure repetition. Exam tip: rational decimals terminate or repeat.

Related tags

Irrational NumbersDecimal ExpansionNon-Recurring DecimalsRational NumbersNumber SystemsMathematicsClass 9 Mcq

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