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    5. Select the number from among the given options that can replace the question mark (?) in the followi

    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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    Relevant for Exams:

    • RRB NTPC

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