How to use the card lottery box

(1) Because three blocks of "k" are the most and 1 blocks of "j" are the least, the possibility of drawing "k" is the greatest, and the possibility of drawing "j" is the least;

(2) To make the possibility of drawing "j" and "k" equal, the number of "k" and "j" should be the same. Because there are four cards, the number of cards "J" and "K" should be two each.