P(A+B)=P(A)+P(B)-P(A*B)
1/3=P(A)+(1/4)-1/5 P(B)=1-P(B')=1-3/4=1/4
P(A)=(20/60)-(15/60)+(12/60)=17/60
P(A')=1-P(A)=1-17/60=43/60
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P(A+B)=P(A)+P(B)-P(A*B)
1/3=P(A)+(1/4)-1/5 P(B)=1-P(B')=1-3/4=1/4
P(A)=(20/60)-(15/60)+(12/60)=17/60
P(A')=1-P(A)=1-17/60=43/60