Question

Calcule a soma dos nove primeiros termos da p.g (3,9,27)

Answer 1

$a_{1} = 3\\\\ q = \frac{9}{3} = 3\\\\ S_{9} = \frac{3.(3^{9} - 1)}{3 - 1}\\\\ S_{9} = \frac{3.19683 - 1}{2}\\\\ S_{9} = \frac{59046}{2}\\\\ S_{9} = 29523$

Resposta: 29523

Espero ter ajudado!