P(A')=0,2 p(b)=0,5 p(anb)=0,8 oblicz p(aub)
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P(A)=1-0,2=0,8
P(AuB)=P(A)+P(B)-P(AnB)=0,8+0,5-0,8=0,5
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P(A)=1-0,2=0,8
P(AuB)=P(A)+P(B)-P(AnB)=0,8+0,5-0,8=0,5