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Riya says that \(\sqrt{2}\) is irrational because its decimal expansion never terminates. What is the flaw in her reasoning?

Answer and explanation

Correct answer: असमाप्य दशमलव आवर्ती होने पर परिमेय हो सकता है; अपरिमेयता के लिए अनावर्ती दशमलव या विरोधाभास द्वारा प्रमाण चाहिए।

Being non-terminating alone is not enough: \(0.333\ldots=\frac{1}{3}\) is rational. The decimal expansion of \(\sqrt{2}\) is non-repeating, or a lowest-form fraction assumption gives a contradiction. Exam tip: distinguish non-terminating from non-terminating non-repeating decimals.

Related tags

Number SystemsIrrational NumbersSquare Root 2Decimal ExpansionProof By ContradictionProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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