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If (a) is assumed odd in (a^2=2b^2), what contradiction appears?

Answer and explanation

Correct answer: \(a^2\) is odd, whereas \(2b^2\) is even

If \(a\) is odd, then its square \(a^2\) is also odd. On the other hand, \(2b^2\) is even for every integer value of \(b\), since it has 2 as a factor. Thus, the equation would make the same number both odd and even, which is the contradiction. Option B is not valid because the equation does not prove that \(b^2\) is odd. Exam tip: the square of an odd integer is odd, and the square of an even integer is even.

Related tags

Number SystemsParityIrrationality ProofSquare Root 2Proof By ContradictionProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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