Question: 1. Define D on Z* by a Db = a + b-ab. Is (Z*, (@) a group? Why or why not? If it is a

1. Define D on Z* by a Db = a +

1. Define D on Z* by a Db = a + b-ab. Is (Z*, (@) a group? Why or why not? If it is a group, is it abelian

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