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    Question

    1221,      1100,      1000,     

    919,        ? What should come in place of question mark (?) in the following number series?
    A 987 Correct Answer Incorrect Answer
    B 1343 Correct Answer Incorrect Answer
    C 877 Correct Answer Incorrect Answer
    D 855 Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    1221 - 11² = 1221 – 121 = 1100 1100 - 10² = 1100 – 100 = 1000 1000 - 9² = 1000 – 81 = 919 919 - 8² = 919 – 64 = 855

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