You don't need to have learned formal logic to conclude the answer to this puzzle in my view. Yes, formal logic concludes it, but plain logic as well. The key is to realize that the answer will go against your learned social intuition and be fine with that. Social communication in many cases is illogical for efficiency reasons and that is fine. It is interesting to point out those cases and make puzzles out of them.

I agree.

I would appreciate it if you would correct my thinking on the subject, if I have erred: https://news.ycombinator.com/item?id=42365506

Thanks in advance.