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    Question

    If (a + b) = 17 and (a2 + b2) =

    145, then find the value of (a Ă— b).
    A 68 Correct Answer Incorrect Answer
    B 70 Correct Answer Incorrect Answer
    C 72 Correct Answer Incorrect Answer
    D 64 Correct Answer Incorrect Answer

    Solution

    (a + b) = 17 Squaring on both sides, we get, a2 + b2 + 2ab = 289 Or, 145 + 2ab = 289 Or, 2ab = 289 – 145 = 144 Or, ab = 144/2 = 72

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