Question

CALCULE A SOMA DOS CINCO PRIMEIROS TERMOS DE UMA PG, ONDE A1=106 E Q=2

Answer 1

$S_{n}=\dfrac{a_{1}(q^{n}-1)}{q-1}\\\\\\S_{5}=\dfrac{a_{1}(q^{5}-1)}{q-1}\\\\\\S_{5}=\dfrac{106(2^{5}-1)}{2-1}\\\\\\S_{5}=106(32 - 1)\\\\\\S_{5}=106*31\\\\\\\boxed{\boxed{S_{5}=3.286}}$