Question

What is the nth term of the geometric sequence 5,15,45,135?

Answer 1

`a_n = 3a_(n-1)`

Explanation:

Each time, the term is three times the last, which is written mathematically as

`a_n = 3a_(n-1)`.

The `n`th term is the term before it multiplied by three.

`3` is known as the common ratio.