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###### Please answer all parts of the question! Problem 1. Compute the subgroups (0), (1), (2), (3),...

Please answer all parts of the question!

Problem 1. Compute the subgroups (0), (1), (2), (3), and (4) of the additive group Zs. Find the greatest common divisor of the following pair of numbers: a) 42 and 76; b) 42 and 7: c) 42 and 21; d) 84 and 144.

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