QuestionThe joint probability mass function of two discrete random variables XX and YY is given by fXY(x,y)={xy36,x,y∈{1,2,3},0,otherwise.f_{XY}(x,y)=\begin{cases}\dfrac{xy}{36}, & x,y\in\{1,2,3\},\\ 0, & \text{otherwise.}\end{cases} What is the value of P(X+Y=4)P(X+Y=4)? Enter the answer correct to two decimal places.