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P(A∧B)=P(B)
P(A∨B)=P(A)=0,9
lub
P(A∨B)=P(A)+P(B)-P(A∧B)=0,9+0,6-0,6=0,9
P(A-B)=P(A)-P(A∧B)=P(A)-P(B)=0,9-0,6=0,3