Let C = {1,2,3,4} and D = {1, 2, 3, 4} then which of the following hold not true in this case?(a) C – D = D – C(b) C U D = C ∩ D(c) C ∩ D = C – D(d) C – D = ΦThis question was posed to me in unit test.I would like to ask this question from Algebraic Laws on Sets in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Let C = {1,2,3,4} and D = {1, 2, 3, 4} then which of the following hol

1.	Let C = {1,2,3,4} and D = {1, 2, 3, 4} then which of the following hold not true in this case?(a) C – D = D – C(b) C U D = C ∩ D(c) C ∩ D = C – D(d) C – D = ΦThis question was posed to me in unit test.I would like to ask this question from Algebraic Laws on Sets in section Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics
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