New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    If x + y = 7 and xy = 10, then the value of

    (1/x3 + 1/x3) is :
    A 0.131 Correct Answer Incorrect Answer
    B 0.543 Correct Answer Incorrect Answer
    C 0.453 Correct Answer Incorrect Answer
    D 0.133 Correct Answer Incorrect Answer

    Solution

    x = 5 & y = 2 ∴ 1/x3 + 1/y3 = 1/125 + 1/8 = 0.008 + 0.125 = 0.133

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