Question

How do you determine whether the sequence `3, 5/2, 2, 3/2, 1,...` is arithmetic and if it is, what is the common difference?

Answer 1

Arithmetic.

Explanation:

Take the 2nd term and minus the 1st term.

Now take the 3rd term and minus the 2nd term.

Notice that the differences are the same. Hence there is a common difference (difference of -0.5).