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Which of the following statements is essential for proving the irrationality of \(\sqrt{3}\) by the contradiction method?

Answer and explanation

Correct answer: यदि \(3\mid a^2\), तो \(3\mid a\)

Assume \(\sqrt{3}=a/b\) in lowest terms. Then \(a^2=3b^2\), so \(3\mid a^2\), which implies \(3\mid a\). This subsequently gives \(3\mid b\), a contradiction. Exam tip: remember that for prime \(p\), \(p\mid a^2\Rightarrow p\mid a\).

Related tags

Number SystemsIrrational NumbersSquare Root 3Contradiction MethodPrime DivisibilityProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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