P(A+B)=P(A)+P(B)-P(AB)=P(A)+P(B)-P(A)P(B)=0.92P(Ac|(A+B))=P(Ac∩(A+B))/P(A+B)=P((Ac∩A)∪(Ac∩B)/P(A+B)=P(Ac∩B)/P(A+B)=P(Ac)P(B)/P(A+B)=0.2*0.6/0.92=0.130435