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What is the correct difference between the roles of (v\neq0) and (\gcd(u,v)=1) in the proof of (\sqrt{3})?

Answer and explanation

Correct answer: (v\neq0) keeps the fraction defined, (\gcd(u,v)=1) is the basis of final contradiction

The direct answer is A. These two conditions have different jobs in the proof. To discuss \(\sqrt{3}=u/v\), the denominator must satisfy \(v\neq0\); otherwise the fraction is undefined. The condition \(\gcd(u,v)=1\) says that u and v have no common factor greater than 1, meaning the fraction is in lowest form. In the contradiction proof, squaring gives \(u^2=3v^2\), which eventually shows that both u and v are divisible by 3. That conflicts specifically with \(\gcd(u,v)=1\), not with merely \(v\neq0\). Option A correctly separates the roles. Option B is wrong because \(v\neq0\) only permits division; it does not immediately imply \(u=3t\). Option C is the opposite of the meaning of coprime numbers. Option D is wrong because nonzero denominator and lowest form are separate requirements. Exam cue: nonzero denominator makes the fraction legal; coprime numerator and denominator make the final contradiction possible.

Related tags

Number-SystemsDenominatorGcdSqrt3

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