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Tell whether each of the following is true for all sets A, B, or C. If false, give a counterexample.?

a. A-B=A- ∅
b. (A ¾B) ̅=(A ) ̅¾B ̅
c. A ¿(B¾C)=(A¿B)¾C
d. (A-B)¿A=A
e. A-(B¿C)=(A-B)¿(A-C)

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