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P(A/B)=P(AnB)/P(B)
P(AnB)=7/15*8/14=7/15*4/7=4/15 wylosowano kule biala i czarna
P(B)=7/15 za I razem wylosowano kule biala
P(A/B)=4/15 : 7/15= 4/15*15/7= 4/7