probabilty

EXAMPLE 10: From the 12 face cards (jacks, queens, and kings) of an ordinary deck of playing cards, three cards are drawn without replacement. Let X be the number of kings selected and Y the number ofjacks. Find or. The joint probability distribution of X and Y, b. P[(X, Y) E A], where A is the region given by {(x, y) | x + y 2 2}