Question
Find the unit digit of (62375Â -
7).Solution
Cyclicity of 2 = 2, 4, 6, 8, 2 Hence, we can see the unit digit repeat themselves after every power of 4 So, unit digit of (62375Â - 7) = unit digit of (24Â XÂ 93 + 3Â - 7) = unit digit of (23Â - 7) = unit digit of (8 - 7) = 1
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