Mathematical Card Tricks
نویسنده
چکیده
Trick: Deal 27 cards, face up onto a table in three columns with 9 cards in each. Ask your victim to choose a card but not to tell you what it is. Three times, ask in which column the card lies, and each time, collect the cards, putting the selected column between the cards in the other two columns, leaving the columns in order, and then deal the cards again by rows to make the next set of columns. After the third choice has been made and the cards re-dealt for the fourth time, the selected card will be number 14 – exactly half-way through the deck.
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