si disminuye en 4 el numero de lados de un polígono convexo, se obtiene otro polígono con 26 diagonales menos. cual es el numero de lados del polígono?

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio