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A student says that \(0.101001000100001\ldots\) is a rational number because it contains only the digits 0 and 1. What is the student's error?

Answer and explanation

Correct answer: The decimal expansion is non-terminating and non-repeating, so the number is irrational.

This decimal never terminates, and the number of zeros increases as 1, 2, 3, 4, …, so no fixed digit block repeats. Hence it is irrational. Exam tip: a non-terminating, non-repeating decimal is irrational.

Related tags

Irrational NumbersDecimal ExpansionNon-Terminating DecimalsNon-Repeating DecimalsNumber SystemsMathematicsClass 9 Mcq

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