| A | B |
|---|
| -2.-1,0,1... | a common difference of 1 |
| 2, 4, 6, 8... | a common difference of2 |
| 0, -1, -2, -3... | a common difference of -1 |
| 2, 5, 8,11... | a common difference of 3 |
| 1.2, .9, .6, .3... | a common diference of -.3 |
| 1/2, 1, 1and 1/2, 2... | a common difference of 1/2 |
| -.3, -.2, -.1, 0... | a common difference of .1 |
| -8, -6, -4, -2... | a comon difference of 2 |
| 1.3, .7, .1, -.5... | a common difference of -.6 |
| 1/3, 2/3, 1, 1 and 1/3... | a common difference of 1/3 |
|
