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A student claims that \(\sqrt{3}=\frac{p}{q}\), where \(p\) and \(q\) are coprime positive integers. From \(p^2=3q^2\), which conclusion about \(p\) is necessary?

Answer and explanation

Correct answer: \(p\) 3 से विभाज्य है

Since \(p^2=3q^2\), \(p^2\) is divisible by 3. As 3 is prime, divisibility of \(p^2\) by 3 implies that \(p\) itself is divisible by 3; write \(p=3k\). Substitution then makes \(q\) divisible by 3 too, contradicting coprimality. Exam tip: use the prime-divides-a-square rule in such proofs.

Related tags

Number SystemsIrrational NumbersSquare Root 3Proof By ContradictionCoprime IntegersDivisibilityProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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