Question

Quatos termo tem a p.g. (2,6,18,...,4374)?

Answer 1

$an=a1. q^{n-1}$

$4374=2.3^{n-1}$

$\frac{4374}{2}=3^{n-1}$

$2187=3^{n-1}$

$3^{7}=3^{n-1}$

$n-1=7$

$n=7+1$

$n=8$