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A student says that \(0.101001000100001\ldots\) is a rational number because it contains only the digits 0 and 1. Which conclusion is correct?

Answer and explanation

Correct answer: The student's claim is wrong; the decimal is non-terminating and non-repeating, so the number is irrational.

The number of zeros between successive 1s increases as 1, 2, 3, 4, …, so no fixed block repeats. A non-terminating, non-repeating decimal is irrational. Exam tip: always check for a repeating block.

Related tags

Irrational NumbersNon-Terminating DecimalsNon-Repeating DecimalsNumber SystemsStatement EvaluationMathematicsClass 9 Mcq

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