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

Answer and explanation

Correct answer: It is irrational because its decimal expansion is neither terminating nor recurring.

In \(0.101001000100001\ldots\), the number of zeros between successive 1s keeps increasing, so no fixed block of digits repeats. Its decimal expansion is non-terminating and non-recurring; therefore, the number is irrational. Using only the digits 0 and 1 does not make a number rational. Exam tip: A rational number has either a terminating decimal expansion or a non-terminating recurring decimal expansion.

Related tags

Real NumbersIrrational NumbersDecimal ExpansionRecurring DecimalsNumber SystemsMathematicsClass 9 Mcq

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