#### Answer

$a_1 = 9$
$a_2 = 99$
$a_3 = 999$
$a_4 = 9999$
Diverges. The terms increase without a bound as $n$ increases.

#### Work Step by Step

$a_n = 10^n - 1$
$a_1 = 10^1 - 1 = 9$
$a_2 = 10^2 - 1 = 99$
$a_3 = 10^3 - 1 = 999$
$a_4 = 10^4 -1 = 9999$
It diverges because the terms increase without a bound as $n$ increases.