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      Question

      √14400 x √8100 - (60)² = ? +

      (80)² What value should come in place of the question-mark(?) in the following questions:
      A 600 Correct Answer Incorrect Answer
      B 900 Correct Answer Incorrect Answer
      C 400 Correct Answer Incorrect Answer
      D 800 Correct Answer Incorrect Answer
      E 700 Correct Answer Incorrect Answer

      Solution

      √14400 x √8100 - (60)² = ? + (80)² 120 × 90 – 3600 = ? + 6400 10800 - 10000 = ? ? = 800

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