2.设A,B为两个事件,P(B)=0.7,P(overline(A)B)=0.3,则P(overline(A)cupoverline(B))=____.

2.设A,B为两个事件,P(B)=0.7,$P(\overline{A}B)=0.3$,则$P(\overline{A}\cup\overline{B})=$____.

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