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modular multiplication a show that the nonzero elements of z3...

Question: modular multiplication a show that the nonzero elements of z3...

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Modular multiplication a. Show that the nonzero elements of Z3 is a group under o. b. Can you find an n > 3 such that the nonzero elements of Zi, do not form a group under O? If so, tell which n, and explain why Z, fails to be a group in this case.

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