Bforball.com. Free online children activities for parents and teachers to teach the preschool kids in a fun and an easy way. Various activity pages for young children of age groups between four and six. It possesses categories like 'Alphabets, Numbers, Colors, Shapes, and Month'.
My own Site for my friends to use Free <b><a href="http://easycalculation">Online Calculators</a></b>.
Welcome to the forum. Cute site!
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.