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Question: please provide formal proofs for ac make sure all steps...

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Please provide formal proofs for a-c. Make sure all steps are clear as well.

(a) Let A, B, and C be subsets of some universal set. If A ZBand BZ C, then A C (b) Let A, B and C be subsets of some universal set. If An B An (C, then (c) Let A, B and C be subsets of some universal set. If A Z B and BSC, then A C.

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