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Mathematical Card Tricks

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Source: This is modified from an effect in John Scarnes clas. sic 1950 book Scarne on Card Tricks. Reason No. 1: Magic Spells and Telepathy Go ...

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Mathematical Card TricksPage 1WWW.MAA.ORG 5Reason No. 5: Laundry Lists are Fun (Socks Appeal)Our first effect is hard to beat for audience participation: up toten people can join in the fun. Minus the socksual connotations it has a long history.Effect: All of us have had the experience of losing sockswhile doing laundry. Some of us lose a sock every time; itsbaffling. Then we end up with all these odd socks! There is asimple solution of course that only a mathematician wouldthink of. As long as you have an even number of odd socksyou can define your own pairs. Take out a deck of cards andhand out for shuffling. Laundry services in hotels of course dont have this problem they always seem to get it right. I think Ive figured outtheir system. Im going to lay out ten pairs of socks hereInever said they matched perfectly in fact all of them are madeup of loners left over from previous relationships. As youspeak take the deck back and count off twenty cards. Deal outthis packet in a haphazard manner into facedown pairs occasionally flashing card faces as you proceed perhaps commenting on the odd matchings. Then turn away and invite upto ten audience members to each peek at a different pair andnote both cards. Its important that you be able to recognizeyour own socks later so remember what they look like. Have one person gather up the pairs in a random order andhand you the packet as you turn back. Okay its time to do thelaundry! It looks like I have a full load of socks today. Repeatedly cut the cards as you speak. Round and round they go. Imone of those people who doesnt believe in spindrying so Illlay them out here to dry instead. Deal the cards out face downone by one in what once again seems to be a haphazard fashionto form a rectangular array.I have four lines of socks here with five socks in each.Turn all of the cards faceup and remark I think they are dryalready. Now ask each person in turn to tell you in whichline(s)/row(s) they see their socks/cards. As each ...

Source: www.spelman.edu

 

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Source: This is modified from an effect in John Scarnes clas. sic 1950 book Scarne on Card Tricks. Reason No. 1: Magic Spells and Telepathy Go ...