T T T T F 18. Let A and B be sets then A + B if, and only if A ¢ B and B ¢ A. For sets A, B, and C, if An B = AN C, then B = C. F 19. F 20. For sets A, B, and C, A U (BNC) = (A U B) N (A U C). For sets A, B, and C, A U (BU C) = (AUB) U C. F 21.

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