Question

Find a9 if the geometric sequence is: 567,-189,63

Answer 1

3720087

Explanation:

Given that,

A geometric sequence : 567,-189,63

First term is : 567

Common ratio : 567/-189 = -3

The nth term of a GP is given by :

`a_n=ar^(n-1)`

n = 9

So,

`a_9=567* (-3)^(9-1)\\\\a_9=3720087`

So, the 9th term of the geometric sequence is 3720087.