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Un article trouvé pour ce sujet.
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Ten stools |
2000-02-06 |
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Haim pose la question :
In a cafe with ten stools, three customers want to be seated, so that no two are next to each other. How many ways can this be done? Do not consider it to be a separate seating if two customers switch seats.
Denis Hanson and Walter Whiteley lui répond. |
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