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Why is a/b taken in lowest form in the proof of √2?

Answer and explanation

Correct answer: So that a contradiction with the coprime condition can be shown

Any rational number can be written as a fraction a/b with b ≠ 0, and common factors can be cancelled. Choosing lowest terms ensures that a and b are coprime before the contradiction argument begins. From a² = 2b², the proof shows that a is even; writing a = 2r then leads to b² = 2r², so b is even as well. Both numbers therefore have the common factor 2, which is impossible for a coprime pair. Without the lowest-terms condition, finding a common factor would not itself contradict anything, because the original fraction might already have had a common factor. Hence option C states the essential purpose.

Related tags

Number-SystemsRational-FormCoprime-ConditionProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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