Ivan Shishkin, Rye (1878)

Problems/CombinatoricsUnreviewed

Des points et des blocs

by araucaria araucana·
30
Difficulty scaleÉchelle de difficulté

This score reflects both the level of the required concepts and the difficulty of the solution.Ce score tient compte à la fois du niveau des notions nécessaires et de la difficulté de la résolution.

  1. 1–10First steps / middle schoolPremiers pas / collège
  2. 11–25Beginner / high schoolDébutant / lycée
  3. 26–50Intermediate / undergraduateIntermédiaire / licence
  4. 51–70Advanced / graduateAvancé / master
  5. 71–90Expert / specializedExpert / spécialisé
  6. 91–100Research levelNiveau recherche
These levels are approximate guides.Ces niveaux sont des repères approximatifs.
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Soit E={1,2,3,4,5,6}E = \{1,2,3,4,5,6\}. Existe-t-il des parties à trois éléments A1,…,Ab⊂EA_{1},\ldots, A_{b} \subset E, b∈N∗b \in \N^{*}, telles que toute paire {x,y}⊂E\{x,y\} \subset E appartienne à exactement une de ces parties ?

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