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Which option gives the correct short order of the proof of √3?

Answer and explanation

Correct answer: Assume rational, then square, then obtain the contradiction that both are divisible by 3

The governing concept is the contradiction proof that √3 is irrational. Begin by assuming √3 is rational, so √3 = a/b where a and b are coprime integers and b is non-zero. Squaring gives 3b² = a². This shows that 3 divides a, so write a = 3k; substitution then shows that 3 also divides b. That contradicts the assumption that a and b have no common factor. Therefore the sequence in option B is the correct short order. A diagram, decimal approximation, zero assumption or subtraction does not establish irrationality rigorously.

Related tags

Number-SystemsSquare-Root-3Proof-OrderIrrational-NumbersProof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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