65
MCQ (Single Correct Answer)
In question 64 (above), $P\left(B / A^{\prime}\right)$ is equal to
A
$\frac{1}{5}$
B
$\frac{3}{10}$
C
$\frac{1}{2}$
D
$\frac{3}{5}$
66
MCQ (Single Correct Answer)
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
A
$\frac{1}{5}$
B
$\frac{4}{5}$
C
$\frac{1}{2}$
D
$1$
67
MCQ (Single Correct Answer)
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
A
$\frac{6}{13}$
B
$\frac{4}{13}$
C
$\frac{4}{9}$
D
$\frac{5}{9}$
68
MCQ (Single Correct Answer)
If $A$ and $B$ are such events that $P(A)>0$ and $P(B) \neq 1$, then $P\left(A^{\prime} / B^{\prime}\right)$ equals to
A
$1-P(A / B)$
B
$1-P\left(A^{\prime} / B\right)$
C
$\frac{1-P(A \cup B)}{P\left(B^{\prime}\right)}$
D
$P\left(A^{\prime}\right) / P\left(B^{\prime}\right)$
69
MCQ (Single Correct Answer)
If $A$ and $B$ are two independent events with $P(A)=\frac{3}{5}$ and $P(B)=\frac{4}{9}$, then $P\left(A^{\prime} \cap B^{\prime}\right)$ equals to
A
$\frac{4}{15}$
B
$\frac{8}{45}$
C
$\frac{1}{3}$
D
$\frac{2}{9}$