Our data reads:
0 36
1 20
2 -28
3 -108
4 -220
5 -364
There is no common difference, since 20 -36 = -16, but just for the following number in the sequence; -28-20 = -48
for the difference between the next pair of numbers: -108+28 = -80.
Another set given reads:
0 20
1 4
2 0
3 20
4 76
5 180
Again, there is NO common difference between the terms : 4 - 20 = -16, while 0- 4 = -4, and 20 - 0 = 20
The sequences given are NOT arithmetic sequences. And they are not geometric sequences either.