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Question
The unit digit in the product $(122)^173$ is
Options:
A .  8
B .  2
C .  6
D .  4
Answer: Option B
Answer: (b)$2^1 = 2, 2^2 = 4, 2^3 = 8, 2^4 = 16, 2^5 = 32$Unit digit in the product of $(122)^173$= Unit digit in $(122)^1$ = 2(1 = remainder when 173 is divided by 4).

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