There are four yellow balls in the first box of table tennis, and three white balls and three yellow balls in the second box. Take a ball at random from each box and find the probability of the following events.

(1) Because the yellow ball in the first box is definitely taken out, only the second box is considered, and the yellow ball in the second box is half, that is, half. So the probability of taking out the yellow ball is 50%, which means the probability of this event is 50%. (2) The yellow ball must be taken out in a box, and the title requires that a yellow ball be taken out, so what is taken out in the second box?