All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars
 perplexus dot info

 The undiscovered numbers (Posted on 2005-10-29)
Arthur and Bert each writes down a positive integer on a piece of paper and then shows it to Charles. Charles then writes two numbers on a blackboard, visible to Arthur and Bert: one of them is the sum of Arthur's and Bert's numbers, and the other is a random number.

After this Charles asks Arthur if he knows Bert's number. If Arthur says he doesn't know, then he asks Bert if he knows Arthur's number. If Bert says he doesn't know, Charles continues with Arthur, then if necessary with Bert and so on... until he gets a positive answer.

When will Charles get a positive answer?

 See The Solution Submitted by Hugo Rating: 3.6667 (6 votes)

 Subject Author Date The posted solution is slightly wrong Steve Herman 2005-11-05 23:44:29 re(2): General formula Tristan 2005-11-05 01:56:04 Sir Arthur versus Bert G. (the drummer) Mindy Rodriguez 2005-11-04 21:11:20 re: General formula Mindy Rodriguez 2005-11-04 20:57:53 re: How many different answers are there? Leigh Lillico 2005-11-04 20:02:25 re: My way Steve Herman 2005-11-04 08:21:20 My way Bender 2005-11-02 19:10:03 re(4): General formula Tristan 2005-11-01 00:22:24 How many different answers are there? Mindy Rodriguez 2005-10-31 22:47:21 re(3): General formula Steve Herman 2005-10-31 21:57:07 re(2): General formula Tristan 2005-10-31 21:22:43 re: General formula Steve Herman 2005-10-31 20:35:01 General formula Tristan 2005-10-31 19:53:21 re: a positive solution pcbouhid 2005-10-31 15:49:15 a positive solution tanx 2005-10-31 15:40:55 more of a riddle, heres the answer pied electron 2005-10-30 22:16:57 re(3): almost a proof Charlie 2005-10-30 19:51:55 re: Don't get it Steve Herman 2005-10-30 19:13:47 Don't get it Old Original Oskar! 2005-10-30 19:00:08 General Solution Steve Herman 2005-10-30 18:52:42 when Ed 2005-10-30 17:24:56 re: X = 13, Y = 16 (continued) Steve Herman 2005-10-30 16:47:06 X = 13, Y = 16 Steve Herman 2005-10-30 16:30:48 re(2): almost a proof pcbouhid 2005-10-30 15:22:31 re: almost a proof Charlie 2005-10-30 12:57:55 almost a proof pcbouhid 2005-10-30 11:44:09 No guesses. Hugo 2005-10-30 10:53:27 re: "Knowing" vs "Guessing" pcbouhid 2005-10-30 10:26:21 "Knowing" vs "Guessing" Federico Kereki 2005-10-30 10:08:06 guesses? Larry 2005-10-30 09:58:08 Two possible solutions Alexis 2005-10-30 08:17:55 Hmmm.... 168.192.0.1 2005-10-30 04:06:26

 Search: Search body:
Forums (0)