IBPS RRB PO Prelims Number Series | Memory Based September – 2017
IBPS RRB PO Prelims Number Series | Memory Based September – 2017
Number Series All Shifts here :
1). 221, 109, 53, 25, 11, ?
2). 0.5, 12, 52, 106, 107, ?
3). 39, 31, 41, 29, 43, ?
4). 3, 5, 13, 49, ?, 1441,
5). 481, 477, 467, 439, 357, ?
6). 2, 8, 28, 54, 53, ?
7). 167, 164, 159, 150, ? , 100
8). 17, 31, 15, 33, 13 , ?
9). 973, 325, 109 , 37 , 13 , ?
10). 0.5, 2, 8, 35, ? , 1079
11). 519, 517, 509, 483, 403, ?
12). 27, 38, 51, 68, 87,?
13). 1094, 365, 122, 41, 14, ?
14). 7, 3, 2, 2, 4, ?
15). 1.5, 3.5, 10, 34, ?, 711
Solution :
1)
×2+3 In Reverse
It means 4 X2+3 =11
So Answer: 4
2)
×8+8, ×4+4, ×2+2, ×1+1 ×0.5+0.5
Answer: 54
3)
8, 10, 12, 14, 16 Difference
2, 2, 2, 2 Difference of Difference
Answer: 27
4)
×2-1, ×3-2, ×4-3, ×5-4, ×6-5
Answer: 241
5)
×8-8, ×4-4, ×2-2, ×1-1 ×0.5-0.5
Answer: 26
6)
×8-8, ×4-4, ×2-2, ×1-1 ×0.5-0.5
Answer: 26
7)
3, 5, 9, 17, 33 Difference
2, 4, 8, 16 Difference of Difference
Answer: 133
8)
14, 16, 18, 20, 22 Difference
2, 2, 2, 2 Difference of Difference
Answer: 35
9)
+2÷3, +2÷3, +2÷3, +2÷3,
Answer: 5
10)
×2+1, ×3+2, ×4+3, ×5+4, ×6+5
Answer: 179
11)
Difference of Difference: ×3
Answer: 241
12)
Difference of Difference: 2, 4, 2, 4
Answer: 110
13)
Logic:34×9, 33×9, 32×9, 31×9, 30×9
Answer: 5
14)
Logic: ×0.5-0.5, ×1-1, ×2-2, ×4-4, ×8-8
Answer: 24
15)
Logic:×1+2, ×2+3, ×3+4, ×4+5
Answer: 141
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