1.	2, 4, 6, 8, 10, ? 9 12 13 14
2.	1/4, 1/2, 1, 2, 4, ? 6 12 8 10
3.	2, 4, 7, 11, 16, ? 23 24 21 22
4.	3, 3, 6, 9, 15, ? 21 15 30 24
5.	5, 10, 20, 40, 80, ? 120 124 160 140
6.	256, 64, 16, 4, 1, ? 1/3 1 1/4 1/2
7.	0.2, 0.4, 0.6, 0.8, ? 1 0.10 10 0.010
8.	1, 8, 27, 64, 125, ? 212 216 225 343
9.	4, 7, 13, 25, 49, ? 77 84 113 97
10.	1, 4, 9, 16, 25, ? 81 36 49 64