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    Question

    What approximate value will come in place of the

    question mark (?) in the following question? (Note: You are not expected to calculate the exact value.) (19.8)Β² – (12.1)Β² = ?
    A 195 Correct Answer Incorrect Answer
    B 256 Correct Answer Incorrect Answer
    C 330 Correct Answer Incorrect Answer
    D 225 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    (19.8) Β² β‰ˆ 20Β² = 400

    (12.1) Β² β‰ˆ 12Β² = 144

    Difference β‰ˆ 400 – 144 = 256

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