IBPS SO Prelims Exam Model Paper 6

The series follows the following pattern:
12 × 1 - 1 = 11
11 × 2 - 2 = 20
20 × 3 - 3 = 57
57 × 4 - 4 = 224
224 × 5 - 5 = 1115
∴ The wrong term in the series is 234.