Question

A recursive rule for a geometric sequence is a1=4/9;an=3an−1. What is the explicit rule for this sequence?

Answer 1

The answer is (4/9)(3)^n-1

Answer 2

a1=4/9
r=an/a(nâ’1)=3
an=a1r^(nâ’1)=(4/9)*(3)^nâ’1