Answer to Question #222743 in Programming & Computer Science for Janien

Question

Let U = {1, 2, 3} and A, B and C be subsets of U. The statement C + A = (A – B) + C is NOT an identity.

Which one of the following alternatives contains sets A, B and C that can be used as counterexample to prove that the given statement not an identity.

•  A. A = {1}, B = {2}, C = {3}
•  B. A = {1}, B = {3}, C = {1, 2}
•  C. A = {1, 2}, B = {2, 3}, C = {1, 2}
•  D. A = {1}, B = { }, C = {3}

Answer 1

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