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Groups > sci.physics.relativity > #475995
| From | Odd Bodkin <bodkinodd@gmail.com> |
|---|---|
| Newsgroups | sci.physics.relativity, sci.physics |
| Subject | Re: Only the teacher knows the answer eh! |
| Date | 2018-11-01 14:29 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <prf2jn$7tc$1@gioia.aioe.org> (permalink) |
| References | <Ys0CD.110234$Do.71201@fx31.am4> <unyCD.125069$el1.13951@fx34.am4> |
Cross-posted to 2 groups.
Keith Stein <keithstein111@gmail.com> wrote: > On 30/10/2018 17:24, Keith Stein wrote: >> " TRICK or TREAT ? " >> >> The math teacher came to the door with a box containing sweets, >> and handed it to the children. "Wait there a moment" he said. >> >> A moment later he reappeared at the door carrying a second box. >> "Now you must choose which box you want." he says "I can tell you >> that there is a 50% chance that this box has twice as many sweets, >> but there is a 50% chance that it only has half as many sweets as >> that first box, so which box do you want, the first box, or the >> second box ?". >> >> Witch box should >> the children choose ? > > It may be that the best strategy is to swap once, and only once, > as recommended by Rotchm: > > "The expectation is higher for the switch."rotchm > > This would indeed be the case if he had prepared a box with 'n' sweets > to hand initially to the children. He had also prepared a second box > with '2n' sweets,and a third box with 'n/2' sweets, which he shuffles > so that he himself does not know which has '2n' and which has 'n/2'. > > > However it could also be true that: > > "It doesn't matter if you (randomly) take the first box or not; > it all evens out in the end, after 100 visits." Jeff Relf > > This would indeed be the case is he had prepared just two boxes, > one with 'n' sweets, and one with '2n' sweets, which again he > shuffles, so that he doesn't know witch is witch, and this would > be easier eh! > > > Not the only understanding of the problem, though. There could be just two boxes, one with N treats and one with 2N treats. The boxes are scrambled by the math teacher so he doesn’t know which one was offered first. -- Odd Bodkin — Maker of fine toys, tools, tables
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Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-10-30 17:24 +0000
Re: Witch box ? Odd Bodkin <bodkinodd@gmail.com> - 2018-10-30 18:13 +0000
Re: Witch box ? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-10-30 19:19 +0000
Re: Witch box ? RichD <r_delaney2001@yahoo.com> - 2018-11-04 19:39 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-05 09:23 +0000
Re: Witch box ? moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-10-30 19:21 +0000
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-05 09:49 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-10-30 13:34 -0700
Re: Witch box ? Buck Dehner <uktaa@yswdooz.ca> - 2018-10-30 21:31 +0000
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-10-31 00:48 +0000
Go to the door 100 times. Jeff-Relf.Me @. - 2018-10-30 18:32 -0700
Re: Go to the door 100 times. Keith Stein <keithstein111@gmail.com> - 2018-10-31 05:35 +0000
Re: Go to the door 100 times. The Starmaker <starmaker@ix.netcom.com> - 2018-10-30 23:33 -0700
Re: Go to the door 100 times. "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-31 23:43 -0700
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-10-30 20:20 -0700
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-01 14:21 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-11-01 07:23 -0700
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-01 14:54 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-11-01 08:19 -0700
Re: Witch box ? Odd Bodkin <bodkinodd@gmail.com> - 2018-11-01 16:19 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-11-01 09:48 -0700
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-06 20:40 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-11-06 13:09 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-06 21:31 +0000
Re: Witch box ? Odd Bodkin <bodkinodd@gmail.com> - 2018-11-06 22:03 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-11-06 14:39 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-07 00:12 +0000
Re: Witch box ? rotchm <rotchm@gmail.com> - 2018-11-06 17:18 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-07 04:58 +0000
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-01 17:37 +0000
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-01 19:46 +0000
Re: Witch box ? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-10-30 14:47 -0700
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-01 14:35 +0000
Re: Witch box ? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-11-05 23:22 -0800
[OT] Which box? (was: Witch box ?) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-10-31 02:31 +0100
Re: [OT] Which box? (was: Witch box ?) moroney@world.std.spaamtrap.com (Michael Moroney) - 2018-10-31 03:19 +0000
Only the teacher knows the answer eh! Keith Stein <keithstein111@gmail.com> - 2018-11-01 07:59 +0000
Re: Only the teacher knows the answer eh! Keith Stein <keithstein111@gmail.com> - 2018-11-01 13:34 +0000
Re: Only the teacher knows the answer eh! rotchm <rotchm@gmail.com> - 2018-11-01 07:27 -0700
Re: Only the teacher knows the answer eh! Keith Stein <keithstein111@gmail.com> - 2018-11-01 15:11 +0000
Re: Only the teacher knows the answer eh! Odd Bodkin <bodkinodd@gmail.com> - 2018-11-01 14:29 +0000
Re: Witch box ? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-11-06 15:24 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-08 09:30 +0000
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-08 21:03 +0000
Re: Witch box ? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-11-08 22:38 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-09 07:40 +0000
Re: Witch box ? "Chris M. Thomasson" <invalid_chris_thomasson@invalid.invalid> - 2018-11-08 23:42 -0800
Re: Witch box ? Keith Stein <keithstein111@gmail.com> - 2018-11-12 17:01 +0000
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