Prove the assertion made in Example 20 that the set {1, 2,
Chapter 2, Problem 49E(choose chapter or problem)
Prove the assertion made in Example 20 that the set {1, 2, . . . , n – 1} is a group under multiplication modulo n if and only if n is prime.p>Reference:EXAMPLE 20 The set {1, 2, . . . , n – 1} is a group under multiplication modulo n if and only if n is prime.
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