Respuesta :

[tex]\bf \stackrel{-5(1)}{-5}~~,~~\stackrel{-5(2)}{-10}~~,~~\stackrel{-5(3)}{-15}~~,~~\stackrel{-5(4)}{-20}~~.....~\hfill \displaystyle\sum \limits_{n=1}^{\infty}~-5n \\\\\\ ~\hspace{34em}[/tex]

Answer:

∑-5(n)

The n is needed and it couldn't be Σ[tex](-5)^n[/tex]

Hope this helps!!!

[tex]Sofia[/tex]