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Reema writes the number \(0.101001000100001\ldots\), in which the number of zeros between successive 1s keeps increasing. Which conclusion about this number is correct?

Answer and explanation

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

The blocks \(1,01,001,0001,\ldots\) keep changing, so no fixed repeating block occurs. A non-terminating, non-repeating decimal is irrational. Exam tip: a repeating decimal always represents a rational number.

Related tags

Irrational NumbersDecimal ExpansionNon-Repeating DecimalsNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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