math
posted by abby .
Tell whether each of the following is true for all sets A, B, or C. If false, give a counterexample.?
a. AB=A ∅
b. (A ¾B) ̅=(A ) ̅¾B ̅
c. A ¿(B¾C)=(A¿B)¾C
d. (AB)¿A=A
e. A(B¿C)=(AB)¿(AC)
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