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In the number \(0.101001000100001\ldots\), the number of zeros between two successive 1s increases by one each time. A student says that it is rational because it contains only the digits 0 and 1. Which is the correct evaluation of the student's argument?

Answer and explanation

Correct answer: It is irrational because its decimal expansion is non-terminating and non-repeating.

Option A is correct. The blocks of zeros between 1s keep increasing, so no fixed block repeats periodically. A rational number has a terminating or recurring decimal expansion. Exam tip: check periodic repetition, not merely the digits used.

Related tags

Irrational NumbersDecimal ExpansionNon-Repeating DecimalsNumber SystemsRational NumbersMathematicsClass 9 Mcq

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