And don’t answer if you don’t understand it either. no guessing

A sequence will be arithmetic if there's a constant difference between terms.

The first sequence is not arithmetic, since the differences between the terms of the sequence are



A sequence is geometric if there's a constant scaling factor being applied to each successive term. To determine if such a constant is there, take the ratio of successive terms.

The first sequence is also not geometric, because the ratios of consecutive terms are



So the first sequence would be assigned (N), which rules out options B and D. Do the same for the next two sequences, which are the only ones you'd need to check.