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P(A1)=1-P(A)
A1 OZNACZA A PRIM
9P(A) * P(A1)=2
9P(A) * (1- P(A) ) =2
9P(A)-9P²(A)=2
9P²(A)-9P(A)+2=0
Δ=81-72=9 √Δ=3
P(A)=[9-3] /18=6/18=1/3 LUB P(A)= [9+3]/18=12/18=2/3
B]
P(A) /[1-P(A)]=3
P(A)=3-3P(A)
P(A)+3P(A)=3
4P(A)=3
P(A)=3/4