Question

Dada a pg (1,4....)determine a soma dos 5 primeiros termos

Answer 1

$> resolucao \\ \\ \geqslant progressao \: geometrica \\ \\ q = \frac{a2}{a1} \\ q = \frac{4}{1} \\ q = 4 \\ \\ \\ sn = \frac{a1(q {}^{n} - 1)}{q - 1} \\ \\ sn = \frac{1(4 {}^{5} - 1)}{4 - 1} \\ \\ sn = \frac{1(1024 - 1)}{3} \\ \\ sn = \frac{1 \times 1023}{3} \\ \\ sn = \frac{1023}{3} \\ \\ sn = 341 \\ \\ > < > < > < > < > < >$