The sequence an = arn − 1

Question

The sequence a_n = ar^n − 1

 is a geometric sequence in which a is the first term and r is the  ---Select--- geometric series last term common ratio partial sum . So for the geometric sequence a_n = 9(3)^n − 1

 the first term is  , and the common ratio is  .

Answer 1

Hello Isaiah

The first term here is

 a₁ = 9(3)^1− 1 = 9

second term is 27 (when you plug 2 for n)

rate is 27/9 = 3