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A student says that
\(0.1010010001\ldots\) is a rational number because it contains only the digits 0 and 1. Why is the student's statement incorrect?

Answer and explanation

Correct answer: यह दशमलव प्रसार असांत और अनावर्ती है, इसलिए यह अपरिमेय संख्या है।

In this decimal, 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-repeating, which identifies an irrational number. Using only 0 and 1 does not make a number rational. Exam tip: A rational number has a decimal expansion that is either terminating or non-terminating recurring.

Related tags

Real NumbersIrrational NumbersDecimal ExpansionNon-Terminating Non-RecurringNumber SystemsMathematicsClass 9 Mcq

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