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      Question

      If x −y =4and xy =45,thenthevalueof x 3

      −y3is:
      A 822 Correct Answer Incorrect Answer
      B 604 Correct Answer Incorrect Answer
      C 15881 Correct Answer Incorrect Answer
      D 82 Correct Answer Incorrect Answer

      Solution

      X – y = 4 Xy = 45 x 3 −y 3 =(x−y)3+3xy(x−y ) =(4)3+3×45(4) =64 + 540 = 604

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