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. [10 Pts] Prove or disprove : (a) (A ? B) ? C = (A ? C) ? (B ? C). (b) A ? (B

. [10 Pts] Prove or disprove : (a) (A ? B) ? C = (A ? C) ? (B ? C).

(b) A ? (B ? C) = (A ? B) ? C.

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5. [10 Pts] Prove or disprove: a) (A - (b) A-(B-C) (A-B)-C

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