There are two boxes of table tennis. There are nine white balls and one red ball in each box. If there are two chances to draw lots, draw red balls twice in the same box.

I took the liberty of explaining it with my high school conceptual knowledge. There is no difference between a box of cigarettes and two boxes of cigarettes, and the probability of winning with a white ball is high. So it must be the second possibility. The winning probability of each red ball is110, and that of the white ball is 9/ 10. In the first lottery, the winning probability of the red ball is110 *110 =1%. Second, there are two possibilities: the white ball precedes the red ball, and the red ball precedes the white ball.