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A student says that \(0.101001000100001\ldots\) is a rational number because its decimal expansion is infinite. Is the student's statement correct or incorrect?

Answer and explanation

Correct answer: गलत, क्योंकि इसका दशमलव प्रसार अनंत और अनावर्ती है।

The student's statement is incorrect. In \(0.101001000100001\ldots\), the number of zeros between successive 1s keeps increasing, so no fixed block of digits repeats. Therefore, its decimal expansion is non-terminating and non-recurring, which makes the number irrational. Option A is wrong because only terminating or recurring decimals are rational. Exam tip: For an infinite decimal, always check whether a fixed digit pattern repeats.

Related tags

Real NumbersRational NumbersIrrational NumbersDecimal ExpansionNumber SystemsMathematicsClass 9 Mcq

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