Question

calcular a soma dos 50° primeiros termos da P.A  ( 2,6,10,...)

Answer 1

$\boxed{S_n = \frac{(a_1+a_n)*n}{2}}$

$S_5_0 = \frac{(2+a_5_0)*50}{2}\\\\ a_5_0 = 2+196\\\\ a_5_0 = 198\\\\\ S_5_0= \frac{(200)*50}{2}\\\\ \boxed{S_5_0 =5000}$