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| cards:red_black_relationship_principle [2020/08/14 09:45] – some references updated, some removed denisbehr | cards:red_black_relationship_principle [2020/08/16 22:12] (current) – reference to date added denisbehr | ||
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| This principle makes use of the fact that there is an equal number of red and black cards in the deck. Thus when two piles are formed, one with x cards and the remainder with 52 - x cards, then the number of red cards in x equals the number of black cards in the remainder plus 26 - x. A special case is that the two piles are equal, with 26 cards each, since in that case 26 - x = 0 and thus the red cards in one half equal the black cards in the other half. | This principle makes use of the fact that there is an equal number of red and black cards in the deck. Thus when two piles are formed, one with x cards and the remainder with 52 - x cards, then the number of red cards in x equals the number of black cards in the remainder plus 26 - x. A special case is that the two piles are equal, with 26 cards each, since in that case 26 - x = 0 and thus the red cards in one half equal the black cards in the other half. | ||
| - | The roots of the trick can be found in an old puzzle involving the literal mixing of wine and water. David Singmaster has traced this puzzle back to W. Rouse Ball's // | + | The roots of the trick can be found in an old puzzle involving the literal mixing of wine and water. David Singmaster has traced this puzzle back to W. Rouse Ball's // |
| Oscar Weigle published "The Little Star Prediction" | Oscar Weigle published "The Little Star Prediction" | ||