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Soit n le nb de boule(s) de même couleur que celle tirée ajouté a chaque tirage. On a une BB et une BN au départ de l'expérience, et on tire une boule à chaque tour avec remise. Dans cette question, on choisit n au hasard dans {0,1,2} avant le début de l'expérience. On effectue 2 tirage et on obtient deux boules blanches. Quelle est la probabilité d'avoir choisi n=0, n=1, n=2 ?
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