IBPS PO Prelims – Number Series Asked on 8th Oct 2017
1). 9, 5, 6, 10.5, 23, ?
Logic: ×0.5+0.5, ×1+1. ×1.5+1.5, ×2+2
Answer: 60
2). 18, 20, 26, 38, 58, 88
Logic: Difference of Difference- 4, 6, 8, 10
Answer: 58
3). 1, 20, 58, 134, 286, ?
Logic: ×2+18, ×2+18, ×2+18
Answer: 590
4). 8, 7, 13, 38, 151, ?
Logic: ×1-1, ×2-1, ×3-1, ×4-1
Answer: 754
5). 32, ?, 1024, 2048, 2048
Logic: ×8, ×4, ×2, ×1
Answer: 256
6). 3072, 192, 24, 6, ?, 3
Logic: ÷16, ÷8, ÷4, ÷2
Answer: 3
7). 3, 4, 9, 28, 113, ?
Logic: ×1+1, ×2+1, ×3+1, ×4+1
Answer: 566
8). 104, 102, 96, 84, ? 34
Logic: Difference of Difference- 4, 6, 8, 10
Answer: 64
9). 6, 280, 410, 468, 490, ?
Logic: Difference of Difference- 144, 72, 36, 18
Answer: 494
10). 11, 5, 4, 4.5, 7, ?
Logic: ×0.5-0.5, ×1-1, ×1.5-1.5, ×2-2
Answer: 15
