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      Question

      Which of the following devices is widely regarded as the

      earliest known calculating tool?
      A Pascaline Correct Answer Incorrect Answer
      B Difference Engine Correct Answer Incorrect Answer
      C Abacus Correct Answer Incorrect Answer
      D Slide Rule Correct Answer Incorrect Answer
      E Napier’s Bones Correct Answer Incorrect Answer

      Solution

      Abacus – Earliest known calculating device.

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