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Topic: MENSA Brain Teasers

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All Forums : [General] : General Trivia > MENSA Brain Teasers
#26
16 JAN 2003 at 2:34am

MichalN

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Originally Posted By InlandAZ (16 JAN 2003 1:41am)
And a little FYI I'm Dyslexic (up the you know what...) I hate working with letters... For what ever reason... numbers (especially 0's and 1's) don't have the same affect on me...  

Interesting
I think I'm not dyslexic, I just have a tendency to make typos. Sometimes I'm amazed at what my fingers are typing... I don't know why I chose letters, I could have chosen numbers just as easily.
I forgot my sig.

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#27
16 JAN 2003 at 2:50am

MichalN

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Joined: 14 SEP 2003

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Originally Posted By InlandAZ (16 JAN 2003 1:43am)
By the way - If that's the first time you've ever seen the puzzle..

You know, I honestly couldn't tell. It is possible that I've seen this puzzle before. I may have even seen the solution before. But it would have been years ago and I don't remember any of it (at least not consciously).

I just sat down and tried to figure a solution... the number of possibilities is limited. I quickly determined that weighing 6:6 balls provides no useful information whatsoever (you know beforehand that one side will be heavier
). So I realized the
initial weighing must be done with a subset, I just wasn't sure if it should be 3:3, 4:4 or 5:5. I tried a couple of combinations and 4:4 seemed like the best option. And then I went from there.  

Once you've weighed 4:4 balls, there aren't really that many options. I guess I kind of looked at the problem from the information theory standpoint - how can you get the most information from every weighing. I spent about two hours on it but it was between 2 and 4am, not my most productive time of the day


Good job!  
 

Thanks
I'm surprised no one else came up with their own solution...
I forgot my sig.

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