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    Question

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

    21       23       49       152     

     ?       3086
    A 655 Correct Answer Incorrect Answer
    B 625 Correct Answer Incorrect Answer
    C 605 Correct Answer Incorrect Answer
    D 615 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    21 x 1 + 2 = 23 23 x 2 + 3 = 49 49 x 3 + 5 = 152 152 x 4 + 7 =  615 615 x 5 + 11 = 3086

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