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In the proof that \(\sqrt{3}\) is irrational, \(a^2=3b^2\) gives \(3\mid a^2\). Which rule justifies the next step?

Answer and explanation

Correct answer: If a prime \(r\) divides \(n^2\), then \(r\) also divides \(n\).

Since 3 is prime, \(3\mid a^2\) gives \(3\mid a\). Set \(a=3k\); then \(b^2=3k^2\), so \(3\mid b\), contradicting lowest terms. Exam tip: state the prime-divisor rule clearly.

Related tags

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

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