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      Question

      Find the unit digit of (14921 - 9).

      B 4 Correct Answer Incorrect Answer
      C 6 Correct Answer Incorrect Answer
      D 2 Correct Answer Incorrect Answer

      Solution

      Cyclicity of 9 = 9, 1, 9 Hence, we can see the last digits repeat themselves after every power of '2'. So, unit digit of 14921 = units digit of 9(20 + 1) = 9
      {Since, (20/2) = 10} So, unit digit of 14921 - 9
      = unit digit of 9 - 9
      = 9 - 9 = 0

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