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

Answer and explanation

Correct answer: This number is irrational because its decimal expansion is non-terminating and does not form a repeating pattern.

A rational number has a terminating or repeating decimal expansion. Here, the number of zeros between successive 1s increases as 1, 2, 3, 4…, so no block repeats. 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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