Question

What's the answer to this question ?

Answer 1

$a_{n} = 6\frac{2}{3} + \frac{1}{3}(n - 1)$
$a_{89} = 6\frac{2}{3} + \frac{1}{3}(89 - 1)$
$a_{89} = 6\frac{2}{3} + \frac{1}{3}(88)$
$a_{89} = 6\frac{2}{3} + 29\frac{1}{3}$
$a_{89} = 36$

The answer is B.