Question

What is the common ratio in this geometric sequence 4, 16, 64, 256, 1024, ...?

Answer 1

`r = 4`

Explanation:

`A_n = A_1r^(n - 1)`

`A_1 = 4`

`A_2 = A_1r^(2 - 1) = A_1r = 16`

`=> 4r = 16`
`=> r = 4`