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    Question

    221, 100, 0, -81,

    ? What should come in place of question mark (?) in the following number series?
    A -187 Correct Answer Incorrect Answer
    B - 133 Correct Answer Incorrect Answer
    C - 177 Correct Answer Incorrect Answer
    D - 145 Correct Answer Incorrect Answer
    E - 165 Correct Answer Incorrect Answer

    Solution

    221 221 - 11² = 221 – 121 = 100 100 - 10² = 100 – 100 = 0 0 - 9² = – 81 -81 - 8² = 81 – 64 = - 145

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