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In the proof of √3, if a student stops after proving only p is divisible by 3, what is the error?

Answer and explanation

Correct answer: To obtain a contradiction, q must also be proved divisible by 3

The proof begins by assuming √3 = p/q in lowest terms, so gcd(p,q) = 1. After squaring, p² = 3q², which implies that 3 divides p. However, that fact alone is not a contradiction: a numerator may be divisible by 3 while the denominator is not. The argument must continue by writing p = 3k and substituting into the equation. This leads to q² being divisible by 3, and hence q is divisible by 3 as well. Then p and q share the factor 3, contradicting gcd(p,q) = 1. Thus option A identifies the missing step; the other options either deny a valid result or introduce irrelevant conditions.

Related tags

Number-SystemsProof-ErrorIrrationalitySquare-Root-3Proof Of Irrationality Of Square Root 2 And Square Root 3Number SystemsMathematicsClass 9 Mcq

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