9. Which of the following are true for all sets A, B, and C. If the statement is true, prove it by showing each is a subset of the other. If not, provide a counterexample.   (i) ∅ × A = ∅ (j) (A \ B) ∪ (B \ C) = A \ C. (k) (A \ B) ∩ (A \ C) = A \ (B ∪ C)

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