Common difference is 0, common ratio is 1, it’s arithmetic and geometric. We call this the common difference, d. A geometric sequence has a constant ratio (multiplier) between each term. 9th - 10th grade. Definitions emphasize the parallel fea-tures, which examples will clarify. Not the same so the sequence is not geometric. Therefore, the difference between a ranking of a 7 and a 6 is the same as the difference between a ranking of a 9 and a 10 on a 10-point scale.
