"Miss Maggie, please accept me as an apprentice. I really want to follow you around. "

One day, a handsome young man asked Meggie earnestly.

"If you want to be my apprentice, you must pass the entrance examination. Let's try this question first! "

Maggie put three small jewelry boxes with the same shape on the table. The lid of the jewelry box is marked with diamonds, rubies and pearls respectively.

"The contents of these three jewel boxes are different from those shown on the label. I don't know which box contains diamonds, rubies and pearls. If you want to know what's in the three jewelry boxes, at least you have to open one box to be sure? "

It's a little difficult! Think about it. If you pass this test, you can become a disciple of Maggie.

[Answer: Just open a box.

For example, open the box of diamond labels first.

If there are pearls in it, the diamonds must be in the ruby label box.

Why? Because, if diamonds are packed in pearl label boxes, rubies are packed in ruby label boxes. In this way, it is inconsistent with the hypothesis of the problem.

Now that we know that the pearl box contains rubies, we know everything in the three jewelry boxes. You got it? ]