I did it by this: x_1 = value of first role x_2 = value of second role given P(x_2>x_1 | x_1 = k) = (6-k)/6 then i did a summation across k and multiplied it by 1/6 but i think this is just an algebraic version of the manual method :(
I noticed that I am quite afraid to put my thought process into words just in case I am wrong, and THAT is completely wrong.
@jfndfiunskj5299