If $A$ and $B$ are events such that $P(A)=0.4, P(B)=0.3$ and $P(A \cup B)=0.5$, then $P\left(B^{\prime} \cap A\right)$ equals to

If $A$ and $B$ are two events such that $P(B)=\frac{3}{5}, P(A / B)=\frac{1}{2}$ and $P(A \cup B)=\frac{4}{5}$, then $P(A)$ equals to

In question 64 (above), $P\left(B / A^{\prime}\right)$ is equal to

If $\quad P(B)=\frac{3}{5}, \quad P(A / B)=\frac{1}{2} \quad$ and $\quad P(A \cup B)=\frac{4}{5}, \quad$ then $P(A \cup B)^{\prime}+P\left(A^{\prime} \cup B\right)$ is equal to

If $P(A)=\frac{7}{13}, P(B)=\frac{9}{13}$ and $P(A \cap B)=\frac{4}{13}$, then $P\left(A^{\prime} / B\right)$ is equal to