An experiment consists of drawing four objects from a container, which holds eight operable, six defective, and 10 semioperable objects. Let X be the number of operable objects drawn and Y the number of defective objects drawn.
(a) Find the joint probability function of the bivariate random variable (X, Y).
(b) Find P(X = 3, Y = 0).
(c) Find P(X < 3, Y = 1).
(d) Give a graphical presentation of (a), (b), and (c).