Flash Mind Reader

http://britton.disted.camosun.bc.ca/psychic.swf

This flash mind reader, makes people wondering how is this working each and every time.
First try it, you will be impressed, it's working. 
Try again, it is working too.
Now, before choosing the numbers, see the sign beside multiples of 9, you will find that this sign is the one appearing.
Simply any number you will choose with this algorithm will lead to a number multiple of 9, so every time the multiples of have the same sign.

It's so simple to figure if you know mathematics. Actually I didn't figure it by myself. But at the end I understood it.

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