Consider the following function.\\
$f_{x,y}(x, y) = \begin{cases} k & \text{if } 2 < x \le 5 \text{ and } 0 < y \le 4\\ 0 & \text{otherwise} \end{cases}$\\
a. Find\\k such that\\$f_{x,y}(x, y)$ is a valid joint probability density function.\
k = \\
b. Using this value for k, calculate the following probability.\
P(3 < X ? 4, 1 < Y ? 3) =