If the joint density function of X1 and X2is given byObtain the density function of Y=X1+X2 \( f\left(x_{1}, x_{2}ight)=\left\{\begin{array}{ll}6 e^{-3 x_{1}-2 x_{2}}, & x_{1}>0, x_{2}>0 \\ 0, & \text { en cualquier otro caso }\end{array}ight. \) 1 answer