If P(A∣B)=P(A)P(A|B) = P(A)P(A∣B)=P(A), what is P(Ac∣Bc)P(A^c | B^c)P(Ac∣Bc)?
P(A)P(A)P(A)
P(Ac)P(A^c)P(Ac)
P(B)P(B)P(B)
P(Bc)P(B^c)P(Bc)