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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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