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    Question

    30 27 20 9 ? -

    25 What should come in place of the question mark (?) in the following number series?
    A - 6 Correct Answer Incorrect Answer
    B - 8 Correct Answer Incorrect Answer
    C 9 Correct Answer Incorrect Answer
    D - 11 Correct Answer Incorrect Answer
    E 4 Correct Answer Incorrect Answer

    Solution

    30 + 1² - 2² = 27 27 + 3² - 4² = 20 20 + 5² - 6² = 9 9 + 7² - 8² = - 6 - 6 + 9² - 10² = - 25 Alternate method: Here gap is always increasing by 4. 30 – 3 = 27 27 – 7 = 20 20 – 11 = 9 9 – 15 = – 6 –6 – 19 = – 25

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