P(A ∪ B)( )。">
P(A ∪ B)( )。">
【正确答案】:0.52
【题目解析】:考点:(1)P(A ∪ B)=P(A)+P(B)-P(AB)(2)若事件A,B相互独立,则P(AB)=P(A)P(B)本题,P(A ∪ B)=P(A)+P(B)-P(AB)=P(A)+P(B)-P(A)P(B)=0.2+0.4-0.2×0.4=0.52