Question

What is tye value of the fourth term in a geometric sequence for which a1=15 and r=1/3

Answer 1

`a_1=15;\ r=(1)/(3)\\\\a_4=a_1r^3\to a_4=15\cdot\left((1)/(3)\right)^3=15\cdot(1)/(27)=\boxed{(5)/(9)}`