from a sack of fruit containing 3 oranges, 2 apples, and 3 bananas, a random sample of 4 pieces of fruit is selected. if x is the number of oranges and y is the number of apples in the sample, find (a) the joint probability distribution of x and y ; (b) p[(x, y ) ∈ a], where a is the region that is given by {(x, y) | x y ≤ 2}.