P(AB)=P(A)*p(B)=0.3*0.5=0.15;P(A∪￣B)=P(A)+[1-P(B)]=0.3+0.5=0.8;P(￣A￣B)=[1-P(A)]*[1-P(B)]=0.7*0.5=0.35; end.
见下图：
