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      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 тИ┤ 1/x3 + 1/y3 = 1/125 + 1/8 = 0.008 + 0.125 = 0.133

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