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# A perfect square is a number that becomes an integer when sq

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A perfect square is a number that becomes an integer when sq [#permalink]  14 Apr 2019, 10:11
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A perfect square is a number that becomes an integer when square rooting it. A, B, and C are three positive integers. The ratio of the three numbers is 1 : 2 : 3, respectively. Which one of the following expressions must be a perfect square?

(A) $$A + B + C$$

(B) $$A^2 + B^2 + C^2$$

(C) $$A^3 + B^3 + C^3$$

(D) $$3A^2 + B^2 + C^2$$

(E) $$3A^2 + 4B^2 + 4C^2$$
[Reveal] Spoiler: OA

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A perfect square is a number that becomes an integer when sq   [#permalink] 14 Apr 2019, 10:11
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