Is 2,14,98,686 a arithmetic sequence or a geometric sequence or neither?

From 2 to 14: 12

From 14 to 98: 84

From 98 to 686: 588

There is no arithmetic sequence because the difference between each number is not the same each time.

Let's try dividing each number by the previous one:

14/2 = 7

98/14 = 7

686/98 = 7

Yes! It's a geometric sequence, multiplying by 7 with each step.