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A student calls the number \(0.101001000100001\ldots\) a rational number. Which is the correct evaluation of the student's statement?

Answer and explanation

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

The zero gaps after successive 1s are 1, 2, 3, ..., so no fixed digit block repeats. Hence it is non-terminating and non-recurring, therefore irrational. Exam tip: look for a repeating block, not merely repeated digits.

Related tags

Number SystemsDecimal RepresentationIrrational NumbersRecurring DecimalsMisconception CheckMathematicsClass 9 Mcq

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