10, 12, 15, 19, ___
24 (+2, +3, +4, +5)
50, 45, 39, 32, ___
24 (-5, -6, -7, -8)
5, 8, 4, 7, 3, ___
6 (+3 -4, +3, -4, +3)
3, 4, 6, 9, 13, ___
18 (+1, +2, +3, +4 ,+5)
30, 20, 10, ___, −10
0 (-10 each time)
2, 6, 18, ___, 162
54 (x3 each time)
4, 7, 10, ___, 16
13 (+3 each time)