home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: rec.puzzles
- Path: sparky!uunet!mcsun!chsun!bernina!igc.ethz.ch!timh
- From: timh@igc.ethz.ch (Tim Harvey)
- Subject: Lost solution
- Message-ID: <1992Dec22.193053.24084@bernina.ethz.ch>
- Sender: news@bernina.ethz.ch (USENET News System)
- Organization: Computational Chemistry, ETH, Zuerich
- Date: Tue, 22 Dec 1992 19:30:53 GMT
- Lines: 28
-
- Dear Netters,
- A log while ago I collected the following brainteaser;
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-
- Mr. S. and Mr. P. are both perfect logicians, being able to correctly deduce
- any truth from any set of axioms. Two integers (not necessarily unique) are
- somehow chosen such that each is greater than 1 and less than 100. Mr. S.
- is given the sum of these two integers; Mr. P. is given the product of these
- two integers. After receiving these numbers, the two logicians do not
- have any communication at all except the following dialogue:
- Mr. P.: I do not know the two numbers.
- Mr. S.: I knew that you didn't know the two numbers; I do not know the
- two numbers.
- Mr. P.: Now I know the two numbers.
- Mr. S.: Now I know the two numbers.
- "The two numbers" in this dialogue refers to those two integers that were
- mysteriously chosen.
-
- Given that the above statements are absolutely truthful, what are the two
- numbers?
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- Anyway (and I hope it's not a FAQ) I didn't save the solution!
-
- Can anyone supply a definitive answer? (Then we can all get back to work)
- Many thanks,
- Tim
-