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    Question

    15 12 5 ? -21

    -40 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

    15 + 1² - 2² = 12 12 + 3² - 4² = 5 5 + 5² - 6² = -6 - 6 + 7² - 8² = -21 - 21 + 9² - 10² = -40

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