1) 6, 12, 18, 24, 30, 36, 42

2) 13, 26, 39, 52, 65, 78, 91

3) 20, 40, 60, 80, 100, 120, 140, 160 ...

4) 43, 86, 129, 172, 215, 258, 301

1) 12, 18, 24, 30, 36.

2) 26, 39, 52, 65, 78.

3) 40, 60, 80, 100, 120.

4) 86, 129, 172, 215, 258.