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Cards With Crosses
You have a stack of 23 cards. Each card has an image of a cross on one side, and an image of a circle on the other side. You know that 14 cards in the stack are laying with the cross up, and therefore 9 cards are with the circle up. But you don’t know in which order the cards are. Moreover, you are in a completely dark room, so you can’t see anything.
How can you, without seeing anything, divide the stack of cards in two smaller stacks, in such a way that both stacks have the same number of cards with a cross up?
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Difficulty
Currently: Challenging (7.5)
