Permutazioni

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2vO/ Traduzione in Italiano del video Permutations http://www.youtube.com/watch?feature=player_embedded&v=XqQTXW7XfYA http://www.khanacademy.org/math/precalculus/v/permutations Help us caption & translate this video! http://amara.org/v/B2vO/