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    Question

    What will come in place of question mark (?) in the following series 

     3, 11, 31 ,69,

    ____
    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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