GRE
The units digit of 3n
The units digit of $$n^{3}$$
The units digit of $$4^{125}$$
4
|x-y|
3
The remainder when the sum of $$1999^{m}$$ and $$2001^{m}$$ divided by 7
The remainder when $$n$$ is divided by 3
1
The remainder when $$7^{13}$$ is divided by 10
7
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