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In Z, let I=〈3〉and J=〈18〉. Show that the group I/J is isomorphic to the group Z6...

In Z, let I=〈3〉and J=〈18〉. Show that the group I/J is isomorphic to the group Z6 but that the ring I/J is not ring-isomorphic to the ring Z6 .

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