Question

Determine a expressão do termo genérico da PG (1, 3, 9, 27, ...)

Answer 1

$a_{n} = a_{1} ·  q^{n-1}$
$q = \frac{27}{9} = 3$
$a_{1} = 1$
$a_{n} = 1 · 3^{n-1}$
$a_{n} = <strong></strong><span>3^{n-1}$