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      Question

       3, 11, 31 ,69,

      ____ What will come in place of question mark (?) in the following series 
      A 132 Correct Answer Incorrect Answer
      B 131 Correct Answer Incorrect Answer
      C 127 Correct Answer Incorrect Answer
      D 128 Correct Answer Incorrect Answer

      Solution

      2+13 =3 3+23 =11 4+33 =31  5+43 =69 6+53=131

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