1.已知事件A,B,C,则以下结论错误的是 () .-|||-(a) overline (AB)=overline (A)cup overline (B) (b) cup C=(Acup C)(Bcup C) ;-|||-(c) overline (Acup B)=overline (A)cup overline (B); (d) -B=A-AB.

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