In exercises consider a sample of size 3 drawn with replacement (without replacement) from an urn containing (i) 1 white and 2 black balls, (ii) 1 white, 1 black, and 1 red ball. For k = 1,2, 3 let Xk = l or 0 depending on whether the ball drawn on the kth draw is white or nonwhite.
Describe the joint probability law of (X1, X2, X3).