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P(A)=1-0,7=0,3
P(A'uB')=1-P(AnB)
P(AnB)=1-0,9=0,1
P(AuB)=P(A)+P(B)-P(AnB)
P(B)=P(AuB)+P(AnB)-P(A)
P(B)=0,6+0,1-0,3=0,4
P(A-B)=P(A)-P(AnB)
P(A-B)=0,3-0,1=0,2