Timeline for Math puzzles for dinner
Current License: CC BY-SA 2.5
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 25, 2013 at 3:02 | review | Late answers | |||
| Jun 25, 2013 at 10:36 | |||||
| Nov 29, 2010 at 0:49 | comment | added | Peter LeFanu Lumsdaine | @jonderry: very nice problem, I hadn’t come across it before! I’ve taken the liberty of editing it slightly to clarify BlueRaja’s misunderstanding: “spin” somewhat suggests randomness, so I’ve changed it to “turn”. Also: as I understand it, the coins/dice are spaced evenly around a circle on the turntable, rigth? i.e. at the vertices of a regular n -gon — is that right? | |
| Nov 29, 2010 at 0:44 | history | edited | Peter LeFanu Lumsdaine | CC BY-SA 2.5 |
changed "spin" to "turn" as described in comment
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| Aug 26, 2010 at 22:23 | comment | added | jonderry | BlueRaja, the guard can turn the table maliciously. The prisoner chooses the locations to flip, and then the guard can turn the table any amount in an effort to prevent the coins from showing all heads. | |
| Aug 6, 2010 at 21:09 | comment | added | BlueRaja | Since the prisoner has infinite tries, he is guaranteed to win eventually by flipping random coins... unless the guard is allowed to be malicious (ie. he doesn't just turn the table randomly)? | |
| Jul 31, 2010 at 8:43 | history | answered | jonderry | CC BY-SA 2.5 |