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      Question

      {(21/20) + (20/21)}2 - {(21/20) -

      (20/21)}2 = ?
      A 4 Correct Answer Incorrect Answer
      B 3 Correct Answer Incorrect Answer
      C 14 Correct Answer Incorrect Answer
      D 12 Correct Answer Incorrect Answer

      Solution

      let a = 21/20 , b = 20/21  so  {(21/20) + (20/21)} 2 - {(21/20) - (20/21)} 2 we know that, (a+ b)2 - (a - b)2 = 4ab 4 x 21/20 x 20/21 = 4 ` `

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