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P(AnB)=P(A)+p(B)-P(AuB)
P(AnB)=1/2+2/3-4/5=15/30+20/30-24/30=11/30
b)
P(A\B)=P(A)-P(AnB)=1/2-11/30=15/30-11/30=4/30=2/15
Proszę bardzo :)