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A student writes the number \(0.101001000100001\ldots\), in which the number of zeros before each successive 1 keeps increasing. Which statement about this number is correct?

Answer and explanation

Correct answer: It is irrational because the increasing number of zeros prevents any fixed repeating block.

The numbers of zeros between successive 1s are 1, 2, 3, 4, …, so no fixed digit block can repeat forever. A non-terminating, non-repeating decimal is irrational. In exams, check repetition, not merely whether the decimal is infinite.

Related tags

Irrational NumbersDecimal ExpansionNon-Terminating DecimalsNon-Repeating DecimalsNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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