Month141516171819?
You have it.
6. yes.
7 What's the matter? what's up
What is it? You do.
Answer:
Albert knows the month, and he can conclude that Bernade certainly doesn't know his birthday. Note that he is "sure", which means that all the dates in this month must have appeared twice, excluding May and June.
After hearing albertz's words, Bernade can guess whether his birthday is July or August through the first point, and then he knows the date, so it is definitely not 14, because there are 14 in July and August, so naturally Bernade knows 15, 16 and14.
After alberts heard alberts's words, according to the second point, there were only three possibilities: 15, 16, 17, but alberts immediately knew her birthday, indicating that he had July in his hand, so it was inferred that Cheryl's birthday should be July 16.
This problem is mainly easy to consider in role thinking. You look very difficult. Play Cheryl yourself, try it with two partners, and try it together according to my ideas, and you will know that the answer is right.