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    Question

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

    12, 23, 68, 271, 1354, ?

    A 8123 Correct Answer Incorrect Answer
    B 8223 Correct Answer Incorrect Answer
    C 8133 Correct Answer Incorrect Answer
    D 8023 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    12×2-1 = 23 23×3-1 = 68 68×4-1 = 271 271×5-1 = 1354 1354×6-1 = 8123

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