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    1. Home
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    3. Quantitative Aptitude
    4. Algebra
    5. If 3x + (1/3x) = 8 then find 27x3 + (1/27x3) = ?

    Question

    If 3x + (1/3x) = 8 then find 27x3 +

    (1/27x3) = ?
    A 602 Correct Answer Incorrect Answer
    B 488 Correct Answer Incorrect Answer
    C 700 Correct Answer Incorrect Answer
    D 802 Correct Answer Incorrect Answer

    Solution

    If  3x + (1/3x)  = N then 27x 3 + (1/27x 3) =  N3 - 3N = 83 - 3 x 8 = 512 - 24 = 488 ` `

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