```The symbols that you look up change every time...so use the same 2
digit number over and over, (like 20 -2 = 18) and the corresponding
symbol will change each time. They have assigned that same symbol to
all of the possible answers for each try.

Not magic, just slight of eye!

****************************
Barb Engvall
=^..^=

Teacher-Librarian
John Campbell Elem
Selah, WA
macbarb@charter.net
http://www.selah.k12.wa.us/JC/jc.cfm

On Apr 22, 2006, at 9:30 AM, DAVID DENNING wrote:

> O wise ones:
>
>   My friend just sent me a math-related "mind-reading" site, and I
> have figured out how it works, but I can't prove it. If you want to
> look at it first, here's the link.
>
>   http://louhi.kempele.fi/~skyostil/archive/dump/flash/psychic.swf
>
>
>   The directions say to choose any two-digit number, add the digits
> together, and subtract them from the original number.  Then you
> look at the list of numbers and find the matching symbol for the
> result.  You do this without entering anything into the computer.
> Then you fix the symbol in your mind and click on the circle, which
>
>   I tried this with several numbers and always came up with the
> same symbol.  I noticed that the final numbers were always
> multiples of nine.  So here is my question.  I think that any time
> you add the digits of a two-digit number together and subtract from
> the original number, you will get a multiple of nine.  Is that
> true?  How do you prove it without going through this process for
> every two-digit number?  I'm pretty sure there's an n+1 involved
> here somewhere!
>
>   Thank you very much!
>
>   Cindy Denning
>   once and future librarian
>   Collinsville, TX
>   cynden744@verizon.net
>
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