Determine whether the binary operation gives a group structure on the given set. If no group results, identify the group property that does not hold. a) Let be defined on 2Z = {2n/n € Z) by a + b = a - b. b) Let be defined on Q by a = b = ab. c) Letbe defined on R by a + b = |ab| d) Letbe defined on Z by a b = ab +a+1

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