What is the Geometric sequence between 1/3, 1/9, 1/27
1st term is 1/3 = \(\dfrac{1}{3^1}\)
2nd term is 1/9 = \(\dfrac{1}{3^2}\)
3rd term is 1/27 = \(\dfrac{1}{3^3}\)
Therefore general formula is \(a_n = 3^{-n}\)