7.
2,20,22,220,222,2220, ?
8.
4, 9, 19, 34, 54,? , 109
9.
7776, 1296, 216, 36, 6, ?
11.
6.25, 9, 12.25, 16, 20.25, 25, 30.25, ?
12.
0.5, 1.5 , 5.5, 14.5, ?
13.
1, 1, 8 , 4, 27, 9, 64, ?
14.
19200, 1920, 240, 40, 10, ?
15.
0, 3, 8, 15, 24, 35, ?
17.
28, 27, 25, 24, 22, 21, ?
19.
245, 230, 200, 140, ?