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    Question

    Select the number from among the given options that can

    replace the question mark (?) in the following series. 4, 21, 85, 256, 513, ?
    A 522 Correct Answer Incorrect Answer
    B 514 Correct Answer Incorrect Answer
    C 536 Correct Answer Incorrect Answer
    D 516 Correct Answer Incorrect Answer

    Solution

    4 × 5 + 1 = 21 21 × 4 + 1 = 85 85 × 3 + 1 = 256 256 × 2 + 1 = 513 513 × 1 + 1 = 514

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