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In the proof of √3, after both p and q become divisible by 3, what is the final conclusion?

Answer and explanation

Correct answer: √3 is irrational

Assume for contradiction that √3 = p/q, where p and q are integers, q ≠ 0, and the fraction is in lowest terms. Squaring gives p² = 3q². This implies that 3 divides p², and therefore 3 divides p; writing p = 3k then gives q² = 3k², so 3 also divides q. Thus p and q have the common factor 3, contradicting the assumption that p/q was in lowest terms. The contradiction does not make √3 an integer, rational, or zero. Instead, it disproves the rational assumption. Therefore √3 is irrational, and option C is the correct final conclusion.

Related tags

Number-SystemsSquare-Root-3Irrationality-ProofProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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