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Which statement is sufficient to reject the rational assumption for √3?

Answer and explanation

Correct answer: Both u and v in lowest form are divisible by 3

A rational number must be expressible as u/v, where u and v are integers, v ≠ 0, and the fraction is in lowest terms, so gcd(u,v) = 1. In the proof, assuming √3 = u/v leads to u² = 3v². The divisibility argument first gives 3 ∣ u and then, after writing u = 3t and substituting, gives 3 ∣ v. Thus u and v have the common factor 3, contradicting their coprime, lowest-form condition. This contradiction rejects the rational assumption. Option B contains the complete sufficient statement; A and C give only partial information, and D does not contradict rationality.

Related tags

Number-SystemsIrrationalityGcdSqrt3Proof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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