Required Mathematical Intelligence

Chapter 26 3 Boxes

In a box with a lid, there are 2 red balls, 2 blue balls and 1 red ball and 1 blue ball. On the lids of the 3 boxes, there are labels with "2 red balls", "2 blue balls" and "1 red ball and 1 blue ball" respectively.Due to negligence, all three signs were wrongly pasted.Now please just open one box, draw out one ball, and then adjust the wrong label.

[Answer: Choose a box with "1 red ball and 1 blue ball" on it. If you find a red ball, it means that there must be 2 red balls in the box.The box labeled "2 blue balls" must contain 1 red ball and 1 blue ball, and the other box must contain 2 blue balls.If the blue ball is drawn, the situation is just the opposite. ]
(End of this chapter)