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      Question

      Find the third proportion of √ 2, √ 7 and √ 21.

      Β Β 
      A 6 Correct Answer Incorrect Answer
      B √6 Correct Answer Incorrect Answer
      C √3 Correct Answer Incorrect Answer
      D √42 Correct Answer Incorrect Answer

      Solution

      Using formula, a:b::c:d = √ 2: √ 7::?:√ 21 ? = √ 2 x √ 3 = √ 6

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