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    Question

    Find the last digit of 753.

    A 1 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 10 Correct Answer Incorrect Answer
    D 7 Correct Answer Incorrect Answer

    Solution

    ATQ, Last digits of powers of 7 repeat in cycle of 4: 71 - > 7 72 - > 9 7^3 - > 3 74 - > 1 Cycle: 7, 9, 3, 1 Now 53 mod 4: 4*13 = 52, remainder = 1 So 753 has same last digit as 71 => 7

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