Question: (d) For all sets X, Y , and Z: if (X Y ) Z, then X Y Z. You must use (in the appropriate place)

(d) For all sets X, Y , and Z: if (X Y ) Z, then X Y Z. You must use (in the appropriate place) proof by contradiction to solve this prob- lem (e) For all sets H, J, K, L, and M , if J L \ M and H M , then H (J K) (H K) \ M . You must use (in the appropriate place) proof by cases for this

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