Mathemagical Card Trick

 by InfinateMonkeys
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How to perform a common magic trick whether you're a magician or a mathematician.
 
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Step 1: Get a Friend

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Ask a friend to randomly select a card from a deck of 21 cards. Have them memorize this card and return it to the deck without revealing it to you.
Optional: Have them shuffle the deck themselves!
betainr says: Nov 5, 2012. 10:33 PM
very nice...but whats the mathamatic calculation works on it...can u explain..please..?
niravdaraniya says: Apr 28, 2012. 12:06 PM
Thanks for this magic
broper says: Aug 22, 2011. 8:32 PM
nice
MorNuN says: Aug 21, 2011. 2:52 PM
that girl's very pretty :$

I knew this trick from a children magazine I used to read when I was a child
valleycrosser says: May 2, 2010. 7:32 PM
 You can also multiply the piles of cards of 7 up to as many as possible(which is seven,by the way)and it still works. You may have to experement at first to find how many times you need to do steps 2 and3. Good trick too. 
MattyNX says: Apr 18, 2010. 12:44 PM
Just tried this trick and it's amazing.... love things like this.
VampiricPie says: Feb 12, 2010. 4:35 PM
It never is in the middle column for me, but it's always the last card in the column it's in, am I doing something wrong?
CalicoP says: May 5, 2009. 11:22 AM
Wow this is really good!
numpska says: Mar 11, 2009. 11:29 AM
Oh my god, this is awesome
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