Red and black card
This focus is built on arithmetic. Before the start of the show focus note number 27. After that ask the viewer to take the cards and shuffle them, pick a card and put it on top of the deck. Then ask to remove any number of cards and count them, let's say 15 cards. Then let the viewer will count the number of red cards among them, for example 6. After that, let him take the second part of the deck and turn the face-up, count down and remember the six black card. Then, the viewer has to put this part of the deck on the cards, which he took at the beginning and all the cards have to give you. The deck is turned face down and you begin to lay out one card from the bottom mentally counting black cards, 27-15 = 12 is the twelfth card of the card that the spectator chose.
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