Resumen de Geometrical meaning of arithmetic series [image omitted], [image omitted] and [image omitted] in terms of the elementary combinatorics

Y. Kobayashi

• The formula [image omitted] is closely related to combinatorics through an elementary geometric exercise. This approach can be expanded to the formulas [image omitted], [image omitted] and [image omitted]. These formulas are also nice examples of showing two approaches, one algebraic and one combinatoric, to a problem of counting