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      Question

      The mean proportional of 3 and 147 is

      _____.
      A 21 Correct Answer Incorrect Answer
      B 27 Correct Answer Incorrect Answer
      C 19 Correct Answer Incorrect Answer
      D 25 Correct Answer Incorrect Answer

      Solution

      We know that, Mean proportion of 'a' and 'b' = √(a Γ— b)
      So, Mean proportion = √(3 Γ— 147) = √441 = 21

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