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    Question

    Calculate the unit digit of

    7882.
    A 4 Correct Answer Incorrect Answer
    B 6 Correct Answer Incorrect Answer
    C 2 Correct Answer Incorrect Answer
    D 8 Correct Answer Incorrect Answer

    Solution

    Cyclicity of 4 (8, 4, 2 and 6)
    So, 7882 = 78(4 ├Ч 20 + 2)
    Therefore, unit digit = 82 = unit digit of 64 i.e. 4

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