probibility and statistics?

Question

Here is probibility density function of X & Y (f(x,y)).What would be
f(x) and f(y):

f(x,y):
12/5(x+y) 0 0 otherwise

Answer 1

Assuming that f(x,y) = 12/5(x+y) and NOT 12/(5(x+y))

Then the marginal density function for
f(x) = 12/5 x(1-x) + 6/5(1-x)^2
f(y) = 12/5 y(1-y) + 6/5(1-y)^2