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Riya writes the number \(0.101001000100001\ldots\), in which the number of zeros between successive 1s keeps increasing. She says that since the number contains only 0 and 1, it is rational. What is the correct evaluation of Riya’s statement?

Answer and explanation

Correct answer: Riya is incorrect because its decimal expansion is non-terminating and non-repeating; therefore, it is irrational.

A rational number has a decimal expansion that either terminates or repeats after some point. Here, the number of zeros between the 1s keeps increasing, so no fixed block of digits repeats periodically. Hence \(0.101001000100001\ldots\) is non-terminating and non-repeating, making it irrational. Using only the digits 0 and 1 does not make a number rational. Exam tip: When a decimal has a pattern, check whether a fixed block actually repeats after a certain point.

Related tags

Real NumbersIrrational NumbersDecimal ExpansionNon-Repeating DecimalsNumber SystemsMathematicsClass 9 Mcq

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