Question

Determine if the sequence below is arithmetic or geometric and determine the

common difference / ratio in simplest form.
12, 9, 6, ...

Answer 1

Answer: Arithmetic and 3

Explanation:

12 - 9 = 3 9 - 6 = 3 The common difference is equal and is three and so it is an arithmetic sequence

12/9 = 4/3 9/6 = 3/2 The ratio is not equal so this is not a geometric sequence