![Algebra-cadabra! Here's a classic magic trick, and the mathematical secret behind it | Mathematics | The Guardian Algebra-cadabra! Here's a classic magic trick, and the mathematical secret behind it | Mathematics | The Guardian](https://i.guim.co.uk/img/static/sys-images/Guardian/About/General/2011/9/27/1317120007267/playing-cards-007.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom%2Cleft&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctZGVmYXVsdC5wbmc&enable=upscale&s=8f8ba6f8e4bf71030072279ec424ce35)
Algebra-cadabra! Here's a classic magic trick, and the mathematical secret behind it | Mathematics | The Guardian
![Mathematical Card Magic: Fifty-Two New Effects (AK Peters/CRC Recreational Mathematics Series): Mulcahy, Colm: 9781466509764: Amazon.com: Books Mathematical Card Magic: Fifty-Two New Effects (AK Peters/CRC Recreational Mathematics Series): Mulcahy, Colm: 9781466509764: Amazon.com: Books](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/61lVbfh14WL._AC_UF1000,1000_QL80_.jpg)
Mathematical Card Magic: Fifty-Two New Effects (AK Peters/CRC Recreational Mathematics Series): Mulcahy, Colm: 9781466509764: Amazon.com: Books
![The card trick 21 cards are taken from which viewer selects one card The 21 cards are divided into 3 piles Viewer identifies pile in which selected card. - ppt download The card trick 21 cards are taken from which viewer selects one card The 21 cards are divided into 3 piles Viewer identifies pile in which selected card. - ppt download](https://slideplayer.com/1502559/5/images/slide_1.jpg)