Off Topic: Mind Reader trick

[BachelorOfComix]

Give this a try.

[comicwiz]

ok, now I'm officially freaked out.... I promised to quit smoking cigars if I can get this thing to stop reading my mind!!!!

[DiceX]

It almost makes me want to tell everyone the trick.

Pretty easy to pick up on it.

But I don't want to ruin it for everyone.

[BachelorOfComix]

[Ares]

It almost makes me want to tell everyone the trick.

Pretty easy to pick up on it.

But I don't want to ruin it for everyone.

I will

If you do the math, you'll see that every possible result has to be a multiple of nine. Any two-digit number can be expressed as a*10 + b. For 73 a=7, b=3. Now the puzzler requests that we subtract the sum of a and b from the number, a*10 + b - (a + b), which becomes a * 9 if you reduce it. Therefore it's a multiple of nine.

 

The glyphs of all the multiples of nine are the same. They are? They are. That's the trick! Every time we refresh the screen the symbols change, unbeknownst to us. It gets better. 90 and 99 which are multiples of nine, have different symbols from the other multiples of nine. But there's no way to get those numbers to come out the other end of the algorithm. Nice twist.

[Arty]

Another one:

 

http://www.flashfunstuff.com/flash_display.php?clip_id=211

 

 

[Joanna]

Another one:

 

http://www.flashfunstuff.com/flash_display.php?clip_id=211

 

 

Easy, but I can see how it could seem mystifying.

[BachelorOfComix]

It almost makes me want to tell everyone the trick.

Pretty easy to pick up on it.

But I don't want to ruin it for everyone.

I will

If you do the math, you'll see that every possible result has to be a multiple of nine. Any two-digit number can be expressed as a*10 + b. For 73 a=7, b=3. Now the puzzler requests that we subtract the sum of a and b from the number, a*10 + b - (a + b), which becomes a * 9 if you reduce it. Therefore it's a multiple of nine.

 

The glyphs of all the multiples of nine are the same. They are? They are. That's the trick! Every time we refresh the screen the symbols change, unbeknownst to us. It gets better. 90 and 99 which are multiples of nine, have different symbols from the other multiples of nine. But there's no way to get those numbers to come out the other end of the algorithm. Nice twist.

[Ares]

Another one:

 

http://www.flashfunstuff.com/flash_display.php?clip_id=211

 

One card is removed and all other cards change..

No original cards remain.