Question

Determine o n° de termos da Pg ( 3,21, .............17294403 )

Answer 1

Temos que:

$a_n=a_1\cdot q^{n-1}$

$17294403=3\cdot 7^{n-1}$
$5764801=7^{n-1}$
$7^8=7^{n-1}$
$8=n-1$
$n=9$