Question
If $A$ and $B$ are two events such that $P(A)=\frac{1}{2}, P(B)=\frac{1}{2}$ and $P(A \mid B)=\frac{1}{4}$, then $P\left(A^{\prime} \cap B^{\prime}\right)$ is
If $A$ and $B$ are two events such that $P(A)=\frac{1}{2}, P(B)=\frac{1}{2}$ and $P(A \mid B)=\frac{1}{4}$, then $P\left(A^{\prime} \cap B^{\prime}\right)$ is