Question
Find the unit digit of (76101 - 6).
Solution
Cyclicity of 6 = 6, 6, 6, 6... Hence, we can see the last digit always remains '6'. So, unit digit of 76101 = units digit of 6101 = 6 So, unit digit of 76101 - 6
= unit digit of 6 - 6
= 6 - 6 = 0
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