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    Question

    12 18 31 51 ?

    112 What will come in place of the question mark (?) in the following series?
    A 92 Correct Answer Incorrect Answer
    B 101 Correct Answer Incorrect Answer
    C 78 Correct Answer Incorrect Answer
    D 86 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    12 18 31 51 78 112 +6 +13 +20 +27 +34 +7 +7 +7 +7

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