CONTAGEM

Permutações:

http://users.telenet.be/vdmoortel/dirk/Maths/permutations.html

Máquina de Galton (Curva de Gauss)

http://www.youtube.com/watch?v=5_HVBhwhwV8

http://www.youtube.com/watch?v=PUydiGzSPTE&NR=1&feature=fvwp

Experimentoteca USP

http://www.cdcc.usp.br/exper/medio