Chapter 9 - Conic Sections, Sequences, and Series - 9.3 Arithmetic Sequences - 9.3 Exercises - Page 727: 12

$\frac{2}{3},\frac{2}{9},\frac{2}{27},\frac{2}{81},\frac{2}{243}$

$a_n=\frac{2}{3^n}$ $a_1=\frac{2}{3^1}=\frac{2}{3}$ $a_2=\frac{2}{3^2}=\frac{2}{9}$ $a_3=\frac{2}{3^3}=\frac{2}{27}$ $a_4=\frac{2}{3^4}=\frac{2}{81}$ $a_5=\frac{2}{3^5}=\frac{2}{243}$