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In the proof of √2, why is it a contradiction when both a and b are even?

Answer and explanation

Correct answer: Because they cannot remain coprime

At the beginning of the proof, √2 is assumed to be a/b in lowest terms. This means that a and b have no common factor other than 1; in other words, they are coprime. The algebraic steps eventually show that a is even and b is also even. Thus 2 divides both numbers, so 2 is a common factor. That directly contradicts the original lowest-terms assumption. It does not mean that a and b become equal, zero, or negative. The contradiction invalidates the assumption that √2 can be represented as a rational fraction, leading to the conclusion that √2 is irrational. Therefore option A gives both the reason and the required logical link.

Related tags

Number-SystemsIrrationality-ProofCoprime-NumbersProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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