AnthonyGerrard
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- Jun 11, 2004
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Oh, for the love of God.
I had no intention of contributing here ever again, but this is driving me insane, watching you people flounder about.
The birthday is July 16.
- A knows for a fact that B cannot know the exact birthday. As he knows the month but not the day, that means the month is one without a unique day listed. This eliminates both May (the 19th) and June (the 18th).
- B realizes the above. Since he knows the day and now is aware that it must be either July or August, this tells him the exact birthday. This means that the day CANNOT be the 14th, or he would not have figured that out.
- A now knows the above. Since he knows the month, and now knows that it cannot be the 14th, he also knows the exact date. If the month were August, he would not have been able to determine the exact day, so this eliminates August, which had both the 15th and the 17th remaining.
- The only date meeting the above criteria (Not in May, June, or August and not the 14th) is July 16, making that the birthday.
The man has it - well done! and well explained too.
You've been lurking!