This technically isn't a coursework or homework problem: I have a uniform Joint density function for the lifetimes of two components, lets call them T1 and T2. They have a uniform joint density function, both are positive it follows, and the region is 0<t1<t2<L and L is some positive constant. So it said the domain has area (L^2)/2 following from this, Density is 1/(((L^2)/2)-1) or uniform density. I have no idea how to get that and area. Can someone help explain? I think I get that since joint I treat one as y and other x i multiply both densities but not really sure.