Maths prize puzzle 27 January 2017: the 21 card trick | A minimum of blind calculation
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21-Card Trick – Numberphile
Computer Science for Fun - cs4fn: Magic Memories Just Shuffling Along: The 21-card trick
There Is A Magic Trick Involving A Player Randomly... | Chegg.com
The 21 Card Trick | STEM
Aesthetically Pleasing Code — The 21 Card Trick created in Python. See how it...
7-7-7: The 21 Card Trick (Jon Racherbaumer) - Meir Yedid Magic
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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
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A Factorial Card Trick
21 Card Trick Revealed - YouTube
Magic 21 - Learncards
7-7-7 – The 21 Card Trick by Jon Racherbaumer – Martin's Magic Collection