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P(A)=P(B1)*P(B2/B1)+P(C1)*P(C2/C1)+P(N1)*P(N2/N1)
P(A)=1/3*1/10+1/3*4/10+1/3*5/10=1/30+4/30+5/30=10/30=1/3
ODP P(A)=1/3
PS
P(B2/B1)=P(B2) bo zdazenia sa nie zalezne
ale ja preferuje ten wzor bo jest bardziej ogolny