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    Question

    Find the unit digit of (8357 - 3).

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

    Solution

    Cyclicity of 3 = 3, 9, 7, 1, 3 Hence, we can see the last digits repeat themselves after every power of '4'. So, unit digit of 8357 = units digit of 3(56 + 1) = 3
    {Since, (56/4) = 14} So, unit digit of 8357 - 3
    = unit digit of 3 - 3
    = 3 - 3 = 0

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