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      Question

      Find the unit digit of (9245 - 2).

      B 4 Correct Answer Incorrect Answer
      C 6 Correct Answer Incorrect Answer
      D 8 Correct Answer Incorrect Answer

      Solution

      Cyclicity of 2 = 2, 4, 8, 6, 2 Hence, we can see the last digits repeat themselves after every power of '4'. So, unit digit of 9245 = units digit of 2(44 + 1) = 2
      {Since, (44/4) = 11} So, unit digit of 9245 - 2
      = unit digit of 2 - 2
      = 2 - 2 = 0

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