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Nidhi says that the number \(0.101001000100001\ldots\) is rational because its decimal expansion contains only 0 and 1. Which statement correctly explains Nidhi's error?

Answer and explanation

Correct answer: The number of zeros between 1s keeps increasing, so no fixed repeating block occurs; hence the number is irrational.

Option C is correct. A rational number has a terminating or eventually repeating decimal expansion. Here, the zeros between successive 1s keep increasing, so no fixed repeating block exists. Exam tip: check repetition, not merely the digits used.

Related tags

Irrational NumbersDecimal ExpansionRational NumbersNon-Repeating DecimalsNumber SystemsMisconception AnalysisMathematicsClass 9 Mcq

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