# How do you determine whether each sequence is an arithmetic sequence: 18, 16, 15, 13,...?

##### 1 Answer

Dec 1, 2016

This sequence is not arithmetic; the difference between successive terms changes.

#### Explanation:

The differences (or "gaps", if you will) between numbers in an arithmetic sequence are constant. This sequence is not an arithmetic sequence, because

The general way to test this for any sequence