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    3. Quantitative Aptitude
    4. Algebra
    5. If p² + q² + r² = 240 and pq – qr – rp = 64, then determine the value of (p + q – r) ².

    Question

    If p² + q² + r² = 240 and pq – qr – rp = 64, then

    determine the value of (p + q – r) ².
    A 220 Correct Answer Incorrect Answer
    B 368 Correct Answer Incorrect Answer
    C 325 Correct Answer Incorrect Answer
    D 400 Correct Answer Incorrect Answer

    Solution

    ATQ,

    (p + q – r) ² = p² + q² + r² + 2(pq – qr – rp) = 240 + 2 × 64 = 368

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