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A student claims that \(0.101001000100001\ldots\) is rational because it contains only the digits 0 and 1. What is the correct correction?

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 keeps increasing, so no fixed block of digits repeats. Hence the decimal is irrational. Exam tip: only terminating or repeating decimals represent rational numbers.

Related tags

Irrational NumbersDecimal ExpansionNon-Repeating DecimalsNumber SystemsRational NumbersMathematicsClass 9 Mcq

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