Sources.

http://en.wikipedia.org/wiki/Pascal's_triangle

http://www.mathsisfun.com/pascals-triangle.html

http://mathworld.wolfram.com/PascalsTriangle.html

http://www.biography.com/people/blaise-pascal-9434176#awesm=~oFvI6Wp9Blap2k

http://en.wikipedia.org/wiki/Blaise_Pascal