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P(AΛB)=P(A) + P(B) - P(AυB)
P(AΛB)=¼ +⅓ -⅕
P(AΛB)=15/60 + 20/60- 12/60
P(AΛB)= 23/60
P(A'ΛB')= 1- P(AΛB) = 1- 23/60=37/60
wydaje mi się że tak to ma być