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f13.net General Forums => General Discussion => Topic started by: Kenrick on January 21, 2005, 11:09:43 AM



Title: need help from teh people with math smarts
Post by: Kenrick on January 21, 2005, 11:09:43 AM
please tell me why this works:

psychic.swf (http://www.dslextreme.com/users/exstatica/psychic.swf)





edit: and here's some humor for after you're done thinking:

Bunny suicides. (http://users.pandora.be/ptuui/)


Title: need help from teh people with math smarts
Post by: sidereal on January 21, 2005, 11:18:28 AM
The answer's always a multiple of 9.  Check the key and look at all the multilpes of 9.  Note that when you reload the assignments change, so the winning symbol changes.

Edit: why it's always a multiple of 9:
Subtracting the sum of the digits from the number is equivalent to subtracting the ones digit and then the 10s digit (x - (y + z) = x - y - z), subtracting the ones digit from a number always results in a multiple of 10, so you're subtracting the 10's digit from a multiple of 10.  This is equivalent to (x * 10 - x) for all numbers in the range, or x * (10 - 1), or x * 9.  Bunnies are funny.


Title: need help from teh people with math smarts
Post by: schild on January 21, 2005, 11:21:24 AM
Some of the bunny suicides may qualify as 'high art.'


Title: need help from teh people with math smarts
Post by: schild on January 21, 2005, 11:23:22 AM
(http://users.pandora.be/ptuui/2_06.jpg)