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    Question

    Select the number from the given option that can

    replace the question mark (?) in the following series: 309, 181, ?, 85, 69, 61, 57
    A 107 Correct Answer Incorrect Answer
    B 112 Correct Answer Incorrect Answer
    C 105 Correct Answer Incorrect Answer
    D 117 Correct Answer Incorrect Answer

    Solution

    The logic followed here is as follows: 57 + 4 = 61 61 + 8 = 69 69 + 16 = 85 85 + 32 = 117 117 + 64 = 181 181 + 128 = 309

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