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    Question

    Find the wrong number in the following number series:

    5 11 23 43 85 171 341

    A 23 Correct Answer Incorrect Answer
    B 85 Correct Answer Incorrect Answer
    C 171 Correct Answer Incorrect Answer
    D 341 Correct Answer Incorrect Answer
    E 11 Correct Answer Incorrect Answer

    Solution

    5 × 2 + 1 = 11
    11 × 2 - 1 = 21
    21 × 2 + 1 = 43
    43 × 2 - 1 = 85
    85 × 2 + 1 = 171
    171 × 2 - 1 = 341

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