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2 prisonniers sont placés dans une salle face à face. On leur met à chacun 1 carte sur la tête, rouge ou verte, de façon à ce qu'ils puissent voir celle de l'autre mais pas la leur. Il y a 3 cartes en tout : 2 vertes et 1 rouge. Le premier qui devine la couleur de la carte sur sa tête sera libéré. Au bout d'un temps de silence, l'un des prisonniers annonce avoir une carte verte et est libéré. Il s'est dit que s'il avait une carte rouge sur la tête, l'autre prisonnier aurait tout de suite déduit qu'il avait une carte verte, et que son silence signifiait donc une carte verte. Il a procédé à un raisonnement de type :A. Inférence effectiveB. Inférence déductiveC. Inférence hypothétiqueD. Déduction simple

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