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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Maths prize puzzle 27 January 2017: the 21 card trick | A minimum of blind calculation
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21-Card Trick – Numberphile
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Aesthetically Pleasing Code — The 21 Card Trick created in Python. See how it...
21 Card Trick: Best Variations, History & Tutorial
Aesthetically Pleasing Code — The 21 Card Trick created in Python. See how it...
How to Do the 21 Card Trick- No Skill Needed | Mind Blowing Magic