The density fnc. of X and Y is
f(x,y)=x+y for 0<x<1, 0<y<1 and 0 otherwise.
a-Are X and Y independent?
b-Find the density function of X
c- Find P(X+Y<1)
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(a) dependent by inspection, the joint density does NOT factor.
(b) on (0,1).
and I'll let you do
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