Question: Let A, B, C, and D be four sets. Prove the following two statements. a. Suppose that A B C D. Prove that if

Let A, B, C, and D be four sets. Prove the following two statements. a. Suppose that A B C \ D. Prove that if x A and x D, then x B. b. A (B C) = (A B) (A C)

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