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Mathemagical Card Trick

Mathemagical Card Trick
How to perform a common magic trick whether you're a magician or a mathematician.
 
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Step 1Get a Friend

Get a Friend
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!
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8 comments
Apr 28, 2012. 12:06 PMniravdaraniya says:
Thanks for this magic
Aug 22, 2011. 8:32 PMbroper says:
nice
Aug 21, 2011. 2:52 PMMorNuN says:
that girl's very pretty :$

I knew this trick from a children magazine I used to read when I was a child
May 2, 2010. 7:32 PMvalleycrosser says:
 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. 
Apr 18, 2010. 12:44 PMMattyNX says:
Just tried this trick and it's amazing.... love things like this.
Feb 12, 2010. 4:35 PMVampiricPie says:
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?
May 5, 2009. 11:22 AMCalicoP says:
Wow this is really good!
Mar 11, 2009. 11:29 AMnumpska says:
Oh my god, this is awesome

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Author:InfinateMonkeys