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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)² – (12.1)² = ?
    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) ² ≈ 20² = 400

    (12.1) ² ≈ 12² = 144

    Difference ≈ 400 – 144 = 256

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