Let A, B and C be any sets (subsets of some universal set U). Use the choose-an-element method to prove that (A – C)n (B – C) = (An B) – C. Reminder: This requires proving two things: (1) (A – C)n(B – C) C (AnB) – C (2) (An B) – C C (A – C)n (B – C)

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