Let the joint probability mass function (pmf) of X and Y be defined by
f(x,y) = x= 1,2, y = 1,2,3,4.
a) Find f₁(x).
b) Find f (y).
c) Find P(X>Y).
d) Find P(X+Y = 3).
e) Find P(X 3-Y).
f) Are X and Yindependent or dependent? Why or why not?