Comments on: New Year’s Brain Teaser http://yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/ Adventures in Open Source Erlang Fri, 16 May 2008 04:06:25 +0000 http://wordpress.org/?v=2.5.1 By: Valentin Dinu http://yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-21199 Valentin Dinu Fri, 06 Apr 2007 06:38:17 +0000 https://admin.yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-21199 Hey, this is cool! Nice one! - Valentin Dinu Hey, this is cool! Nice one! - Valentin Dinu

]]> By: Ankit Verma http://yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-20063 Ankit Verma Sun, 01 Apr 2007 18:47:23 +0000 https://admin.yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-20063 hey good one. Took me around 15min. really amazing. Can be easily put to search algorithms. thanks. hey good one. Took me around 15min. really amazing. Can be easily put to search algorithms. thanks.

]]> By: John Goodwin http://yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-7445 John Goodwin Thu, 01 Feb 2007 01:40:20 +0000 https://admin.yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-7445 There is actually an algebra for solving problems like this. It is formally equivalent to fractional design of experiments with three levels. The three levels are left side, right side, and not weighed. Each of the 12 balls is a 'main effect' and the null hypothesis to be tested is that all the balls weigh the same. You want an experimental design (a set of three contrasts) in which the 12 main effects are not aliased to each other, and which can detect deviations from the null hypothesis and their sign. I mention these details because it allows one to design similar problems easily. There is actually an algebra for solving problems like this. It is formally equivalent to fractional design of experiments with three levels. The three levels are left side, right side, and not weighed. Each of the 12 balls is a ‘main effect’ and the null hypothesis to be tested is that all the balls weigh the same. You want an experimental design (a set of three contrasts) in which the 12 main effects are not aliased to each other, and which can detect deviations from the null hypothesis and their sign.

I mention these details because it allows one to design similar problems easily.

]]> By: David Bergman http://yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-6840 David Bergman Mon, 29 Jan 2007 04:09:22 +0000 https://admin.yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-6840 Ok, it took me 2 minutes to find the solution, in broad strokes, and some 5 minutes more to formalize it. Will formalize it as a Ruby app (or Erlang?) and hide it somewhere. /David Ok, it took me 2 minutes to find the solution, in broad strokes, and some 5 minutes more to formalize it. Will formalize it as a Ruby app (or Erlang?) and hide it somewhere.

/David

]]> By: Aidan http://yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-4530 Aidan Mon, 08 Jan 2007 22:09:08 +0000 https://admin.yarivsblog.com/articles/2006/12/30/new-years-brain-teaser/#comment-4530 ha, got it! took me longer than I had hoped, then again at least it didn't take a whole year like that cursed Rubik's Cube! It's still surprises me that it can actually be done in 3 moves - lot of information to derive from so few tests but there you go. ha, got it!

took me longer than I had hoped, then again at least it didn’t take a whole year like that cursed Rubik’s Cube!

It’s still surprises me that it can actually be done in 3 moves - lot of information to derive from so few tests but there you go.

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