Question: Modern Algebra: Exercise , Let p be a prime, p= 3. Prove that the group of units U ( Z n) is cyclic for i

Modern Algebra:

Modern Algebra: Exercise , Let p be a prime, p= 3. Prove

Exercise , Let p be a prime, p= 3. Prove that the group of units U ( Z n) is cyclic for i 21. ( Hint. Find the order of Itp in this group

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