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P(A)=1-4/9=5/9
P(AnB)=P(B)=1/3
P(AuB)=P(A)+P(B)-P(AnB)
P(AuB)=5/9+1/3-1/3=5/9
2.
P(B)=1-0,2=0,8
P(AnB)=0,3+0,8-0,9=0,2