Vestibular Analise combinatoria (aula 1 de 6) Introduction to Combinatorics

http://www.youtube.com/watch?v=IBBdA7VwCfQ(PARTE 1)
http://www.youtube.com/watch?v=Ey-l7YcLkrs(PARTE 2)
http://www.youtube.com/watch?v=KvQ5GXja34U(PARTE 3)
http://www.youtube.com/watch?v=LphGz71Mes8(PARTE 4)
http://www.youtube.com/watch?v=yh0B_VgJ9S8(PARTE 5)
http://www.youtube.com/watch?v=pqQl8eePRrg(PARTE 6)