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P(A'nB)=P(B\A)=P(AuB)-P(A)
P(A)=P(B)
P(AuB)+P(AnB)=P(A)+P(B)
2*P(B)=0,75+0,25=1
P(B)=0,5
P(A\B) = P(A) - P(AnB)
P(A\B)=0,5-0,25=0,25