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    Question

    Find the remainder when 798 is divided by 5.

    A 8 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 4 Correct Answer Incorrect Answer

    Solution

    7 тЙб 2 (mod 5) So 798 тЙб 298 (mod 5) Powers of 2 mod 5: 2┬╣ тЙб 2 2┬▓ тЙб 4 2┬│ тЙб 8 тЙб 3 2тБ┤ тЙб 16 тЙб 1 Pattern length = 4 98 ├╖ 4 gives remainder 2 So 298 тЙб 2┬▓ тЙб 4 (mod 5) Remainder = 4

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