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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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