Question
Find the last digit of 753.
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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