Question

Calcule a soma dos 5 primeiros termos da pg ( 2, 4

Answer 1

$PG~(2, 4, ...)\\\\\\ a_1=2\\ q\to \frac{4}{2} =2\\n=5\\\\\\ S_n= \dfrac{a_1.(q^n-1)}{q-1} \\\\\\ S_n= \dfrac{2.(2^5-1)}{2-1} \to \\\\\\ S_n= \dfrac{2.(32-1)}{1} \to \\\\ S_n=2.31\to \\\\ \boxed{S_n=62}$