12, 33, 45, 78, 123, 201, ?
12 + 33 = 45 33 + 45 = 78 45 + 78 = 123 78 + 123 = 201 123 + 201 = 324 series given below follows the following pattern: number + preceding term
420, 380, 340, 300, 280, 220, 180
178, 184, 196, 216, 246, 286
74, 79, 86.5, 101.5, 109, 124, 141.5
687, 666, 635, 594, 543, 480
17113 3853 1105 229 75
...4 6 12 30 90 310
...109 106 101 94 86 74
...7, 27, 10, 32, 17, 37
164, 20, 216, -40, 284, -112
213, 215, 225, 257, 313, 393
