History of Famous 21 card trick?

[del1992]

Does anyone know the history of the famous 21 card trick?
the one with 3 rows of 7 cards.

 

[JDENredden]

I want to know what the mathematical logic behind it is. lol

J.

 

[Rmana]

I was teaching math last year and I wanted to show my kids this, but I couldn't find the mathematical reasoning behind it.

 

[timsilva]

Great question, I have no clue myself, but I would love to find out.

Is the official name "The 21 Card Trick"?

 

[JDENredden]

http://www.bbc.co.uk/dna/h2g2/alabaster/A544989

Via- D ICE R, Via MSN.

J.

 

[industrialchild]

Nice link JDEN! It's amazing how complex that simple trick is from a mathematical point of view.