(a) If p is an odd prime and n > 0, then the multiplicative group of units...

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(a) If p is an odd prime and n > 0, then the multiplicative group of units in the ring Zpn is cyclic of order pn-1(p - 1).

(b) Part (a) is also true if p = 2 and 1 ≤ n ≤ 2.

(c) If n ≥ 3, then the multiplicative group of units in z2n is isomorphic to Z2⊕Z2n-2

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