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If p/q is in lowest form, which situation creates a contradiction in the proof of √3?

Answer and explanation

Correct answer: Both p and q are divisible by 3

To prove √3 irrational, assume that √3 = p/q, where p and q are integers, q ≠ 0, and the fraction is in lowest form, so gcd(p,q) = 1. Squaring gives p² = 3q². Because 3 is prime and divides p², it must divide p; write p = 3k. Substitution then gives 9k² = 3q², so q² = 3k², which implies that 3 divides q as well. Thus both p and q have the common factor 3, contradicting the lowest-form condition. Therefore option D identifies the contradiction. Options A, B, and C are assumptions used in the proof, not contradictions.

Related tags

Number-SystemsSqrt3Proof-By-ContradictionProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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