Question: (a) Let X, Y, and Z be arbitrary sets. Use an element argument to prove that X (Y Z) (X Y) (X Z). (b) Let

(a) Let X, Y, and Z be arbitrary sets. Use an element argument to prove that X (Y Z) (X Y) (X Z).

(b) Let A and B be arbitrary sets. Use an element argument to prove that A (B A) = A B.

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