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A student claims that the number 0.101001000100001... is rational because it contains only the digits 0 and 1. Which statement correctly corrects the student's claim?

Answer and explanation

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

The number of zeros between successive 1s is 1, 2, 3, 4, ..., so no repeating block can occur. A non-terminating, non-repeating decimal is irrational. Exam tip: check repetition, not merely which digits appear.

Related tags

Irrational NumbersDecimal ExpansionNon-Terminating DecimalsNon-Repeating DecimalsNumber SystemsMisconception AnalysisMathematicsClass 9 Mcq

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