First, we should see if there are any common differences. We do this by subtracting each term from its previous:
1.5 - 1.2 = 0.3
1.2 - 0.96 = 0.24
Already, we can tell that there is no common difference.
Let's look at common ratio:
1.2/1.5 = 0.8
0.96/1.2 = 0.8
0.768/0.96 = 0.8
Therefore, there is a common ratio and it is 0.8.
