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If an answer writes √2 = a/b but does not mention gcd(a,b) = 1, what is the best comment?

Answer and explanation

Correct answer: The contradiction in the proof will become weak

A rational number can be represented as a/b, but for this contradiction proof the fraction must be chosen in lowest terms, meaning gcd(a,b) = 1 and b ≠ 0. Starting with √2 = a/b and squaring gives a² = 2b². The parity argument then shows that a is even and b is also even. That conclusion is a contradiction only because the original representation was assumed to have no common factor. Without explicitly stating gcd(a,b) = 1, the proof has not established the condition that the final conclusion violates. Therefore option A is the best mathematical comment. The omission does not prove b = 0 or rationality, and it does not make the proof complete.

Related tags

Number-SystemsProof-WritingIrrationalitySquare-Root-2Proof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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