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      Question

         If the surface area of two spheres is in the ratio

      81 : 25, then what is the ratio of their radius.
      A 5 : 8 Correct Answer Incorrect Answer
      B 7 : 9 Correct Answer Incorrect Answer
      C 5 : 7 Correct Answer Incorrect Answer
      D 9 : 5 Correct Answer Incorrect Answer

      Solution

      The correct answer is D

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