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      Question

      What approximate value

      will replace the question mark (?) in the following? 39.99 Γ— 40.01 – 31.01 Γ— 30.99 = ?
      A 336 Correct Answer Incorrect Answer
      B 459 Correct Answer Incorrect Answer
      C 549 Correct Answer Incorrect Answer
      D 639 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      39.99 Γ— 40.01 – 31.01 Γ— 30.99 = ? 40 Γ— 40 – 31 Γ— 31 ~ ? ? ~ 1600 – 961 ? ~ 639

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