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Ecrire un programme qui retourne la factorielle de n quand on lui fournit la valeur de n. La factorielle d'un nombre entier n est le produit des entiers successifs de 1 à n. On écrit : n ! = factorielle de n = 123.......n .Par exemple : 5 ! = 12345 = 120 . Les factorielles sont utilisées dans de nombreux problèmes, en particuliers dans des problèmes de dénombrements et dans des problèmes de probabilités .

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