Which describes the difference between the two sequences? First Sequence: 1, 6, 36, 216 ... Second Sequence: 3, 6, 9, 12, ... The first sequence is geometric because there is a common difference of 6. The second sequence is arithmetic because there is a common ratio of 3. The first sequence is arithmetic because there is a common difference of 6. The second sequence is geometric because there is a common ratio of 2. The first sequence is arithmetic because there is a common ratio of 2. The second sequence is geometric because there is a common difference of 6. The first sequence is geometric because there is a common ratio of 6. The second sequence is arithmetic because there is a common difference of 3.