# How does this trick work (Mystical Ball)

Discussion in 'Community Discussion' started by njmac, Jan 29, 2006.

1. ### njmac macrumors 68000

Joined:
Jan 6, 2004
#1
www.mysticalball.com

I know it must be a math trick, but there are several different symbols there. How can the "mystical ball" know which number I picked every single time?
It doesn't matter which number I pick - it always seems to "know".

What's up with this?

2. ### cslewis macrumors 6502a

Joined:
Jul 23, 2004
Location:
40º27.8''N, 75º42.8''W
#2
I think someone had this a few years ago. It's some kind of mathematical gobbledygook that I don't understand... in any case, my number was 27, and it said it was 9.

[EDIT] Oops, it's the same symbol. I'm so dumb sometimes.

3. ### Chaszmyr macrumors 601

Joined:
Aug 9, 2002
#3
The chart changes so that every possible number that the answer could be has the same symbol, and thats the symbol reflected in the ball when you click it.

4. ### njmac thread starter macrumors 68000

Joined:
Jan 6, 2004
#4
I didn't really notice the chart changing at first. Now that I look at it again, it seems so simple. I have never been good at the magic tricks that use math.

5. ### Chaszmyr macrumors 601

Joined:
Aug 9, 2002
#5
The answer will always be a multiple of 9, by the way, so that is the domain of the "every possible number that the answer could be"

6. ### clayj macrumors 604

Joined:
Jan 14, 2005
Location:
visiting from downstream
#6
Exactly. Try a few numbers (99, 88, 77, 65, etc.) and you will see that the formula ("xy" - "x+y") ALWAYS results in a number with the same symbol... in this case, the six-pointed star.

7. ### Chaszmyr macrumors 601

Joined:
Aug 9, 2002
#7
The chart changes, so it's not always a 6 pointed star... Hence what makes this little trick kind of deceptive.

8. ### clayj macrumors 604

Joined:
Jan 14, 2005
Location:
visiting from downstream
#8
Ah... it came up three times as a 6-pointed star for me, so I guessed it was a static layout.

This is very similar to the one where you're shown five face cards, asked to pick one, and then when you click the button it's gone. The trick there is that ALL FIVE cards are gone, replaced with different cards.

Solving the trick in both cases is easy; run through the scenario several times in your head and record what you see, THEN click the button.

Joined:
Jan 8, 2004
Location:
Maryland
10. ### PlaceofDis macrumors Core

Joined:
Jan 6, 2004
#10
yeah i noticed the chart changed on its second try and knew something was up. but its pretty cool.

11. ### mkrishnan Moderator emeritus

Joined:
Jan 9, 2004
Location:
Grand Rapids, MI, USA
#11
Fool me once, shame on you, fool me twice, shame on me too.

12. ### naniraki macrumors newbie

Joined:
Sep 1, 2012
#12
OOps i got it....Every time when u reset the chart the symbol at the zero is the answer. what ever number u choose the answer will be the same symbol at the zero. give a try

13. ### Nabooly macrumors 6502a

Joined:
Aug 28, 2007
#13
hmm....all I'm getting is a crystal ball and I put in a question and it gives me answers the same as an 8 ball. :/