The 24 puzzle is an arithmetical puzzle in which the objective is to find a way to manipulate four integers so that the end result is 24. For example, for the numbers 4, 7, 8 and 8, one possible solution is to subtract 8 divided by 8 from 7 and multiply the result by 4. All four numbers must be used exactly once. The problem has been played as a card game in Shanghai since the 1960s, using playing cards, and it has been known by other names, including Maths24. A proprietary version of the game has been created which extends the basic game to more complex mathematical operations.
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Source 24 (puzzle) (Wikipedia)
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1. Pagat (John McLeod): Twenty-Four
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The basic game for two players will be described first, followed by variations for a larger number of players and extra options.
2. 24 (puzzle) (Wikipedia)
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The 24 puzzle is an arithmetical puzzle in which the objective is to find a way to manipulate four integers so that the end result is 24.
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