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Donats 3 conjunts A,B,C, considerau les igualtats: (a) (A\setminus B)\cup (B\setminus C)=(A\cup B)\setminus (B\cap C) (b) (A\setminus B)\cup (B\setminus C)=(A\cup B)\setminus C. Quina de les afirmacions següents és vertadera?