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In the proof that \(\sqrt{3}\) is irrational, suppose \(\frac{p}{q}\) is in lowest terms and \(p^2=3q^2\) is obtained. Which fact is needed to establish the contradiction?

Answer and explanation

Correct answer: यदि किसी अभाज्य संख्या से \(p^2\) विभाज्य है, तो वह \(p\) को भी विभाजित करती है।

From \(p^2=3q^2\), we get \(3\mid p^2\). Since 3 is prime, \(3\mid p\); putting \(p=3k\) then gives \(3\mid q\) too. Thus \(p,q\) are not coprime. Exam tip: use the prime-divisor property in such proofs.

Related tags

Number SystemsIrrational NumbersSquare Root 3Proof By ContradictionPrime Divisor PropertyProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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