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A student claims that \(0.10110111011110\ldots\), where blocks of 1s have lengths 1, 2, 3, 4, ... and are separated by 0s, is rational because it is written in decimal form. What is the error in the claim?

Answer and explanation

Correct answer: It is irrational because its decimal expansion is non-terminating and non-repeating.

Writing a number in decimal form does not make it rational. The blocks of 1s grow as 1, 2, 3, ..., so no fixed repeating block exists. A non-terminating, non-repeating decimal is irrational. Exam tip: check for repetition.

Related tags

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

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