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Dans une urne qui contient des boules de couleur noire, verte et blanche. Combien de boules faut-il tirer pour être sûr d'avoir 2 boules de couleur différente ? (1) Il y a 3 boules noires, soit une de plus que le nombre de boules de couleur blanche. (2) Il y a une boule verte de plus qu'il n'y a de boules noires.

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