Question

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

    15      32       51       74      ?        134

    A 103 Correct Answer Incorrect Answer
    B 107 Correct Answer Incorrect Answer
    C 115 Correct Answer Incorrect Answer
    D 110 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    15 + 17 = 32 32 + 19 = 51 51 + 23 = 74 74 + 29 =  103 103 + 31 = 134

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