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      Question

      The value of (0.7 x 0.7 x 0.7 + 0.3 x 0.3 X 0.3) / (0.7

      x 0.7 – 0.7 x 0.3 + 0.3 x 0.3) is _________.
      A 2 Correct Answer Incorrect Answer
      B 1 Correct Answer Incorrect Answer
      C 3 Correct Answer Incorrect Answer
      D -1 Correct Answer Incorrect Answer

      Solution

      Let a = 0.7 and b = 0.3 [(0.7)3 + (0.3)3] / [(0.7)2- (0.7 x 0.3) + (0.3)2] = (a³+b³)/ (a²-ab + b²) [(a + b) (a²-ab+b²)]/ (a²-ab + b²) = a + b = 0.7 +0.3 = 1

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