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    Question

    Select the number from the given option that can replace

    the question mark (?) in the following series: 4, 9, 19, ?, 79, 159
    A 59 Correct Answer Incorrect Answer
    B 49 Correct Answer Incorrect Answer
    C 31 Correct Answer Incorrect Answer
    D 39 Correct Answer Incorrect Answer

    Solution

    (4 x 2) + 1 = 8 + 1 = 9 (9 x 2) + 1 = 18 + 1 = 19 (19 x 2) + 1 = 38 + 1 = 39 (39 x 2) + 1 = 78 + 1 = 79 (79 x 2) + 1 = 158 + 1 = 159

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