Question

Determine if the sequence 1, 2, 3, 5, 8, 13... is arithmetic, geometric, or niether

Answer 1

An arithmetic sequence has a constant difference between adjacent terms.

A geometric sequence has a constant ratio between adjacent terms.

Check if arithmetic:
2-1 =
3-2=
5-3=
8-5=
13-8=
if they are all identical, then it is arithmetic.

Check if geometric:
2/1 =
3/2 =
5/3 =
8/5=
13/8=
if they are all identical, then it is geometric.

Answer 2

It's Fibonacci