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Join Date: Nov 2006
Location: South Africa
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Puzzling Cybernetics

05/29/2007 2:53 AM

can anyone please shed some light on this ?

http://www.ebaumsworld.com/mindprobe.html

How does this work ?

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Power-User
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#1

Re: puzzling cybernetics

05/29/2007 7:30 AM

No matter what 2 digit number you pick, deducting its two component numbers will produce a number divisible by 9. Since the maximum answer you can get by doing this is 81 you will find that at closer inspection every number that is divisible by 9 up to and including 81 has the same symbol

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#2
In reply to #1

Re: puzzling cybernetics

05/30/2007 12:57 AM

Did you know this one or did you just figure it out now? Your answer is darn clever!!!

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#3
In reply to #2

Re: puzzling cybernetics

05/30/2007 3:50 AM

I did it once and was very impressed....so impressed I did it again which is where the illusion let itself down It was the same symbol. Third time confirmed my suspicions.

A good magician will not perform the same trick twice because they rely a great deal on the element of surprise.

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#4
In reply to #3

Re: puzzling cybernetics

05/31/2007 12:00 AM

There was one like this a few years ago based on cards. It would predict the card you chose. Very clever, but as you say, after a few times, the magic was gone.

Well done!!!

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#5
In reply to #4

Re: puzzling cybernetics

05/31/2007 3:34 AM

Thank you

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Commentator

Join Date: May 2007
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#6

Re: Puzzling Cybernetics

05/31/2007 5:39 AM

This trick is a function of an old accounting check. It is call "casting out nines". It was very useful before electronic calculators.

http://en.wikipedia.org/wiki/Casting_out_nines

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#7

Re: Puzzling Cybernetics

06/02/2007 6:01 PM

Do not know but it did not work, i tried 5 times and only the 1st it was ok

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#8
In reply to #7

Re: Puzzling Cybernetics

06/04/2007 3:48 AM

Casting out nines definitely works, and the puzzle on the web page definitely works. So what didn't work???

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