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  3. problem 3 for each of the following sets with operations...

Question: problem 3 for each of the following sets with operations...

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Problem 3. For each of the following sets with operations, explain why they do or do not form a group: (a) Z/12Z under addition (b) Z/12Z under multiplication. (c) {a + bv 21, b є Q} \ {0} under multiplication. (d) For a fixed nonnegative integer, EC: uder multiplication (e) For a fixed nonnegative integer, {z C 21j under addition

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