Question: Please help with with the following question. 7.2. Verify that the integers l, 3, 7, 9, ll, 13, l7, 19 form a group under multiplication

Please help with with the following question.

Please help with with the following question.
7.2. Verify that the integers l, 3, 7, 9, ll, 13, l7, 19 form a group under multiplication modulo 20. Explain why this group is not isomorphic to 2

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