Each of the following is incorrect. Explain briefly why or give a counterexample. (a) Addition is a binary operation on the set S = {-1,0, 1 }. (b) If x, y and z are elements of a group G and xy = zx, then y = z. (c) If a is a nonidentity element of a group G and m is a positive integer such that am = e, then Ja| = m. %3D

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