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Je dispose d'un classeur recensant les médailles d'or gagnées au dernier JO.Pour chaque médaille d'or on dispose du nom du gagnant et de sa nationalité.On veut afficher l'histogramme illustrant la répartition du nombre de médailles remportées par chaque pays représenté.On ne peut pas créer le graphique demandé directement à partir du tableau initial.Il faut calculer au préalable le nombre de médailles gagnées par chaque pays.Quelle fonction utiliser pour faire ce calcul ?

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