Question

calcular o 10 termo da p.g(9,27,...)

Answer 1

$q=3; n=10; a_{1} =9; a_{n} = a_{10} =?$
$a_{n} = a_{1} * q^{n-1}$⇒
$a_{n} =9* 3^{10-1}$⇒
$a_{n} =9* 3^{9}$⇒
$a_{n} =9*19683$⇒
$a_{n} =177147$