def suite_geometrique(debut,fin,u_0,raison):
    suite = [u_0]
    for i in range(debut,fin):
        suite.append(suite[i-debut]*raison)
    return suite
def suite_arithmetique(debut,fin,u_0,raison):
    suite = [u_0]
    for i in range(debut,fin):
        suite.append(suite[i-debut]+raison)
    return suite