Q2. 
Two brother $X$ and $Y$ appeared for an exam. Let $A$ be the event that $X$ is selected and $B$ is the event that $Y$ is selected. The probability of $A$ is $\dfrac{1}{7}$ and that of $B$ is $\dfrac{2}{9}$. Find the probability that both of them are selected. 
A.  1/63 

B.  2/35 

C.  2/63 

D.  9/14 