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      Question

      6, 12 , 20 ,30

      ,  ? What will come in place of question mark (?) in the following series 
      A 40 Correct Answer Incorrect Answer
      B 42 Correct Answer Incorrect Answer
      C 45 Correct Answer Incorrect Answer
      D 47 Correct Answer Incorrect Answer

      Solution

      2 +22 =6 , 3+32 =12 , 4+42=20 , 5+52 =30 , 6 +62=42

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