
how dows this work?
how does this know what number you are thinking of? try it and let me know http://www.vsisystems.com/numberboy.asp

It doesn't.
It just knows that eight divided by two is four. It doesn't just work for 1 25 ....It works for any integer, positive or negative.

Here,,,,
1: Think of a number from 1 to 25.<BR>2: Double that number.<BR>3: Add 8.<BR>4: Divide by 2.<BR>5: Subtact your original number.<BR>6: The answer is four.<BR><BR>f(x) = ((( x + x ) + 8 ) / 2)  x<BR><BR>So...<BR><BR>f(x)  ((2x + 8) / 2)  x<BR><BR>So...<BR><BR>f(x) = (2x /2) + (8/2)  x<BR><BR>So...<BR><BR>f(x) = x + 4  x<BR><BR>So....<BR><BR>F(x) = 4<BR><BR>Always.

So...
It isn't a trick, it's just an illusion. A pretty stupid one at that, IMO. It doesn't even try to look impressive. There *are* some pretty good number teasers out there...Often that rely on psychology/sociology, or some esoteric mathmatical function to arrive at the solution. This one, on the other hand, just relies on the users having renounced formal education after the third grade. But I digress. All I really meant to say, is that I find this particular "puzzle" remarkably unsophisticated, so if you were planning on getting the source, and using it somewhere, you'd be better off giving it a second thought, and finding something a little more worthwhile.<BR><BR><BR><BR><BR>

The proof for where 8 is any rational number....
Step 1: Pick any rational number.  f(x) = x<BR>Step 2: Double that number.  f(x) = x + x <BR>Step 3: Add any rational number.  f(x,y) = x + x + y<BR>Step 4: Divide the total by two.  f(x,y) = (x + x + y) / 2<BR>Step 5: Subtract the original number.  f(x,y) = ((x + x + y) / 2)  x<BR><BR>So, this can be reduced to:<BR><BR>First: f(x,y) = ((x + x + y) / 2)  x<BR><BR>Then: f(x,y) = ((2x + y) / 2)  x<BR><BR>Then: f(x,y) = x + (y / 2)  x<BR><BR>Then: f(x,y) = y / 2<BR>

Stupid forum jacked up my formatting...

You spent all that time on SPAM
The dork who posted it just wanted you to visit his site. Notice the similarity between his username and the site name???<BR><BR>You wanna go kick yourself a while?<BR><BR>He got you...good.<BR><BR>

Yep..I saw it...
After I had visited the site, anyway.<BR><BR>But...I decided to give him the benefit of the doubt.<BR><BR>Besides, the puzzle was so stupid, that deriding it publically was kinda cathartic.

Heh...we used to use that one...
...or a variation of it...when I was in Cub Scouts. Let's see...that was...oh damned, I ran out of fingers, toes, and hairs on my head to count with. Well, so many years ago none of you were born.<BR><BR>

Like I said in my reply...
....This one, on the other hand, just relies on the users having renounced formal education after the third grade. <BR><BR>Perfect for cub scouts. <Grin />
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