Suppose P(A)=x,P(B)=y,P(A∩B)=zP(A) = x, P(B) = y, P(A \cap B) = zP(A)=x,P(B)=y,P(A∩B)=z. What is P(Ac∣Bc)P(A^c | B^c)P(Ac∣Bc) in terms of x,y,zx, y, zx,y,z?
\frac{1-x-y+z}{1-y}
\frac{1-x}{1-y}
\frac{1-z}{1-y}
\frac{x+y-z}{y}