Question

What is the 8th term of the sequence 6,18,54,....?

Answer 1

$r = \frac{18}{6} \\ r = 3 \\ \\ a_{n} = a_{1} * r^{n-1} \\ a_{8} = 6 * 3^{8 - 1} \\ a_{8} = 6 * 3^{7} \\ a_{8} = 6 * 2187 \\ a_{8} = 13122$