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Which option correctly distinguishes (q\neq0) and the coprime condition in the proof of (\sqrt{3})?

Answer and explanation

Correct answer: (q\neq0) keeps the fraction defined, the coprime condition gives contradiction

The direct answer is A. In proving csqrt{3}c irrational, we first suppose csqrt{3}=p/qc, where p and q are integers, q is not zero, and p/q is in lowest terms. The condition cq\neq0c is needed simply because division by zero is undefined; it allows p/q to be a valid fraction. After squaring, cp^2=3q^2c, and divisibility reasoning shows that 3 divides p. Writing cp=3rc and substituting then shows that 3 also divides q. Thus p and q have a common factor 3, contradicting the coprime condition. Option A is correct because it distinguishes the definition condition from the contradiction-producing lowest-terms condition. Option B is wrong: q being non-zero alone does not prove cp=3kc. Option C reverses the result; coprimality does not give q=0. Option D is wrong because the two conditions serve different purposes. Memory cue: non-zero denominator makes the fraction legal; coprime numerator and denominator make the contradiction possible.

Related tags

Number-SystemsDenominatorCoprimeSqrt3

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