You can win a new car in a game show if you can put 4 balls in cups in the right order. the cups are lettered a, b, c, and d and the balls are lettered the same. one ball goes in each cup but no goes in a cup with the same letter. you try ball c in cup a, d in b, a in c, and b in d and find none of these are correct the show's host gives you a hint that ball d does not go in cup a and ball a does not go in cup b. which balls go in which cups?