Question: Given a ring R, we can consider the unit group R*. For each of the following rings R, find the structure of the group

Given a ring R, we can consider the unit group R*. For

Given a ring R, we can consider the unit group R*. For each of the following rings R, find the structure of the group R*. (a) R=Z/18Z (b) R = Z[a] (where = 2 + i)

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