1.
Let AA and BB be two events such that P(B∣A)=12P(B \mid A) = \dfrac{1}{2}, P(A∣B)=14P(A \mid B) = \dfrac{1}{4} and P(A∪B)=58P(A \cup B) = \dfrac{5}{8}. Consider

(S1)    P(A′∪B)=78(S_1)\;\; P(A' \cup B) = \dfrac{7}{8}

(S2)    P(A′∩B′)=38(S_2)\;\; P(A' \cap B') = \dfrac{3}{8}

Then: