If P(A)=0.5,P(B∣A)=0.4,P(B∣Ac)=0.2P(A)=0.5, P(B|A)=0.4, P(B|A^c)=0.2P(A)=0.5,P(B∣A)=0.4,P(B∣Ac)=0.2, what is P(A∣B)P(A|B)P(A∣B)?
2/3
1/2
1/3
3/4