2. Opposing events, because at least one white ball includes a white ball, a red ball and two white balls, the union of the two red balls is equal to a complete set, that is, all possible situations of the event "take any two balls with two red balls and two white balls in a pocket", and the two events do not intersect.
3, the same event/the same event, because it is only a white ball, the other ball must be just a red ball.
I don't know if I understand.