Question: need answer quickly need a elaborated answer will give 5 Stars fr sure 15. Prove that the set {1,3,7,9} is an abelian group under multiplication

need answer quickly

need answer quickly need a elaborated answer will give 5 Stars fr

need a elaborated answer will give 5 Stars fr sure

15. Prove that the set {1,3,7,9} is an abelian group under multiplication modulo 10

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