What? Doing a Rubik's cube Behind ur back?

L

LaffyTaffyKidd

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May 27, 2007
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My friend recently just did a rubik's cube behind his back w/o memorizing anything.. Is this possible ?? or do you think that he set the cube up?
 
He didn't look at the cube before? How should that be possible.. the same thing as when I say: I'm think of a number between 0 - 99999999999999999999. Gues it..
 
If he did NOT set the cube up, then no, that's impossible (well, not impossible, but the chance is pretty much 1 in 43 quintillion).

Your so-called friend is lying to you.
 
Either he set the cube up to a previously memorized position, or he memorized it without your knowledge.
 
shelley said:
Either he set the cube up to a previously memorized position, or he memorized it without your knowledge.
Click to expand...

If he said nothing at all, then he likely pre-planned the solve sequence as a joke. An honest person would not leave a doubt in your mind. He would tell you if it was randomly scrambled or not, and how much he knew about it before he solved it.
 
You can do a neat trick similar to this legitimately using some cube math. The center of the cube group has 2 permutations, the identity permutation and the superflip permutation. What this means is that the superflip commutes with every other permutation in the cube group.

What this means is you can do a cool trick. I did this to some of my students where I work and they thought it was really neat. I took a solved cube and set it up into the superflip. I then did 2 turns, like U R or something to that affect. The cube at this point, to the untrained eye, looks scrambled. I then asked them to scramble by 2-3 moves to ensure I had not rigged the cube. I told them that my trick only works "most of the way" and that I can get the cube close but not solve it. The last part I have to do with my eyes. So I, behind my back, executed the superflip and brought the cube back around to where everyone could see it. Now I simply have to undo the (probably) 4-5 moves that were done on the cube and it is solved.

The kids who saw me do this knew that I do blindfolded solving, but they thought it was cool that I could "even do it without memorizing" haha. After that I told them the math behind it (I teach at a math learning center, so I kinda had to) ;-)

Chris
 
still if you don't know a thing about blindsolving, you could think he didn't memo it even though he did. someone who is very fast can memo in like 18 to 25 sec...

but probably he did set it up.

BTW, i guesss uuhhm 2305843008139952128

( biggest perfect number under 20 digits... )
 
Last edited:
cmhardw said:
You can do a neat trick similar to this legitimately using some cube math. The center of the cube group has 2 permutations, the identity permutation and the superflip permutation. What this means is that the superflip commutes with every other permutation in the cube group.

What this means is you can do a cool trick. I did this to some of my students where I work and they thought it was really neat. I took a solved cube and set it up into the superflip. I then did 2 turns, like U R or something to that affect. The cube at this point, to the untrained eye, looks scrambled. I then asked them to scramble by 2-3 moves to ensure I had not rigged the cube. I told them that my trick only works "most of the way" and that I can get the cube close but not solve it. The last part I have to do with my eyes. So I, behind my back, executed the superflip and brought the cube back around to where everyone could see it. Now I simply have to undo the (probably) 4-5 moves that were done on the cube and it is solved.

The kids who saw me do this knew that I do blindfolded solving, but they thought it was cool that I could "even do it without memorizing" haha. After that I told them the math behind it (I teach at a math learning center, so I kinda had to) ;-)

Chris
Click to expand...

Hahaha :p

Very nice Chris :p
 
DAE_JA_VOO said:
(well, not impossible, but the chance is pretty much 1 in 43 quintillion).
Click to expand...

Just because there are 43 quintillion possible combinations does not mean, that the chance is 1 to 43 quintillion to solve it with a random combination.


I guess 13263534754646926569. I hope i'm right!
Click to expand...
I don't remember anymore but I think you are VERY close :D
 
Swoncen said:
DAE_JA_VOO said:
(well, not impossible, but the chance is pretty much 1 in 43 quintillion).
Click to expand...

Just because there are 43 quintillion possible combinations does not mean, that the chance is 1 to 43 quintillion to solve it with a random combination.
Click to expand...

You're wrong. The moves he applied to that cube is a solution to only one of those combination. Which means that the chances of doing it right is as many combination a cube has.
 
lets say you make 8 random moves ( L L' stuff does not count ) there is no chance at all that you could have solved one of ALL possible states since the cube could be scrambled in a way that AL LEAST more than 8 moves are necessary.

so I'm sure the chance of solving a random scrambled cube with random moves is les than 1 in 43 quintillion if you are using less than 20 moves.

Also, if you are using a random number of moves the chance of solving it is less than 1 in 43 quintillion…

so I think Swoncen is right

Remi
 
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