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If ext{\(\sqrt{3}\)} is assumed to be ext{\(p/q\)} , where ext{\(p\)} and ext{\(q\)} are coprime integers, which fact produces the contradiction in the proof?

Answer and explanation

Correct answer: Both ext{\(p\)} and ext{\(q\)} are divisible by 3

From ext{\(p^2=3q^2\)} , ext{\(p^2\)} and hence ext{\(p\)} are divisible by 3. Put ext{\(p=3k\)} to get ext{\(q^2=3k^2\)} , so ext{\(q\)} is also divisible by 3. This contradicts coprimality. Exam tip: use the prime-divides-a-square property.

Related tags

Number SystemsIrrational NumbersProof By ContradictionSquare Root 3Coprime IntegersPrime DivisibilityProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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