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?
Feb 20, 2017
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).