Magic!

[galaxyAbstractor]

OMG! It really works! http://www.mysticalball.com/

[QueenHawkeye]

Heh, my biology teacher showed us that once. The reason that it can tell what you're going to pick next is because of some confusing math that I really don't care about. [But it's cool anyways!]

[satheesh]

Cool one.
Edit:
Any one know this trick.

[QuwenQ]

This is how it works:

Consider the numbers in the list. Now apply the Math you are asked to perform in the puzzle for all numbers from 10 to 19..

10 - (1 + 0) = 9
11 - (1 + 1) = 9
19 - (1 + 9) = 9

This will surely enlighten you. Amazingly, the answer is always nine.
Why is the answer always the same? That would be a dumb question.
Anyway, here's the answer.
Let's take from the samples shown above.
The original numbers always increment by one (10,11,12....19), but so does the values we are using to subtract ( 1+0,1+1,1+2...1+9).
Obviously, it will yield the same number.

Now consider all numbers between 20 and 29..
20 - (2 + 0) = 18
21 - (2 + 1) = 18
Its 18 here.
And how is 18 related to 9 ? Its a multiple of 9 offcourse.

Similarly, for the set 30-39, it will be 27. 27 is another multiple of 9.
40-49 will return 36.

Now take a close look at the symbols for the number 9 and its multiples.
Well! You must have guessed it by now. All the symbols are the same and this is the answer.

[satheesh]

Thanks QuwenQ.

[Toberal]

... The Gathering.

XD

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Ok Edit. The cristal ball is wrong or I make a mistake.

55, 5+5=10 , 10-5= 5

Dont show any of the simbol.

[Sharky]

If you look, all the multiples of 9 (9, 18, 27, 36, etc) all have the same image.

And, 55. 5+5=10. 55-10=45. 45 is a multiple of 9 :D

[QuwenQ]

That's what I just said. Beat'cha to it.

[galaxyAbstractor]

But if the answer always is 9 why doesen't the same symbol come up then???

[arsonistx]

Yeah, I figured out exactly how this works as soon as I read the directions. Haha, nice though.