Question: 0. (3 pt): Prove that A ? (B ? C) ? (A ? B) ? C. 1. (3 pt): Prove or disprove: A B =

0. (3 pt): Prove that A ? (B ? C) ? (A ? B) ? C.

1. (3 pt): Prove or disprove: A B = B A.

2. (6 pt): Prove that |A B| = |A| |B|.

3. (6 pt): Prove that A ? (B ? C) = (A ? B) ? (A ? C).

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