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What is the most exam-useful caution in the proofs of √2 and √3?

Answer and explanation

Correct answer: Always write the fraction in lowest coprime form

The proof uses contradiction and begins by assuming √n = u/v, where u and v are integers in lowest terms and v ≠ 0. The lowest-terms condition is essential because it gives gcd(u,v) = 1. The divisibility argument then shows that the same prime divides both u and v, contradicting this condition. Without first reducing the fraction, finding a common factor would not necessarily be a contradiction: unreduced fractions can naturally have common factors. Therefore A is the crucial exam precaution. B is invalid because a denominator cannot be zero, C is only approximation, and D is an unjustified assumption.

Related tags

Number-SystemsProof-WritingLowest-TermsIrrationalityProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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