Dear Readers, Here we have given the list of Number Series Questions Asked in SBI PO Examination which was held on 1st & 8th July 2018 (All Shifts). Aspirants can use this.
Number Series Questions Asked in SBI PO Prelims Examination (1st & 8th July 2018) All Shifts:
Directions (Q. 1 – 24) what value should come in the place of question mark (?) in the following number series?
1). 4, 9, 17, 35, ? , 139
Explanation:
The pattern is, *2 + 1, *2 – 1(alternatively)
The answer is, 69
2). 200, 101, 102, 154, ?
Explanation:
The pattern is, *0.5 + 1, *1 + 1, *1.5 + 1, *2 + 1,…
The answer is, 309
3). 5000, 1000, 400, 320, ? , 1638.4
Explanation:
The pattern is, *1/5, *2/5, *4/5, *8/5, *16/5,..
The answer is, 512
4). 2, 15, 59, 117, 116, ?
Explanation:
The pattern is, *8 – 1, *4 – 1, *2 – 1, *1 – 1, *0.5 – 1,…
The answer is, 57
5). 26, 138, 29, 142, 34, 148, ?
Explanation:
The pattern is alternative difference,
26 + 3 = 29, 29 + 5 = 34, 34 + 7 = 41
138 + 4 = 142, 142 + 6 = 148
The answer is, 41
6). 171, 172, 174, 183, ? , 872
Explanation:
The pattern is, +10, +21, +32, +43, +54,…
The answer is, 247
7). 142, 156, 114, ? , 86, 212
Explanation:
The pattern is, +(1*14), -(3*14), +(5*14), -(7*14), +(9*14),…
The answer is, 184
 8). 13, 23, 67, 131, ? , 779
Explanation:
The pattern is, *2 – 3, *3 – 2(alternatively)
The answer is, 391
 9). 47, 78, ? 156, 199, 246
Explanation:
The difference is, 31, 37, 41, 43, 47,.. (Prime numbers)
The answer is, 115
10). 118, 124, 136, ? , 178, 208
Explanation:
The difference is, 6, 12, 18, 24, 30,..
The answer is, 154
11). 23, 27, 39, 59, ? , 123
Explanation:
The difference of difference is 8, 8, 8,..
The answer is, 87
12). 70, 69, 73, 64, 80, 55 , ?
Explanation:
The pattern is, -12, +22, -32, +42, -52, +62,..
The answer is, 91
13). 8, 18, 50, 98, ? , 338
Explanation:
The pattern is, (prime no)2 × 2
(ie)., 22 × 2, 32 × 2, 52 × 2, 72 × 2, 112 × 2, 132 × 2,…
The answer is, 242
14). -9, -2, 17, 54, ? , 206
Explanation:
The pattern is, 13 – 10, 23 – 10, 33 – 10, 43 – 10, 53 – 10, 63 – 10
The answer is, 115
15). 39, 79, 119, 159, 199, ?
Explanation:
The difference is, 40, 40, 40,…
The answer is, 239
16). 7, ? , 7, 17, 63, 309
Explanation:
The pattern is, *1 – 2, *2 – 3, *3 – 4, *4 – 5, *5 – 6,..
The answer is, 5
17). 17, 22, 39, 76, 141, ?
Explanation:
The difference of difference is, 12, 20, 28, 36,..
The answer is, 242
18). 14, 526, 183, 399, 274, ?
Explanation:
The pattern is, +83, -73, +63, -53, +43,..
The answer is, 338
19). 16, 21, 76, 171, 296, ?
Explanation:
The difference of difference is, 50, 40, 30, 20
The answer is, 441
20). 53, 51.4, 48.2, 41.8, ? , 3.4
Explanation:
The difference is, *2
The answer is, 29
21). 8, 7, 13, 38, 151, ?
Explanation:
The pattern is, *1 – 1, *2 – 1, *3 – 1, *4 – 1, *5 – 1,..
The answer is, 754
22). 5760, ? , 192, 48, 16, 8
Explanation:
The pattern is, ÷ 6, ÷ 5, ÷ 4, ÷ 3, ÷ 2
The answer is, 960
23). 140, 135, 152, 115, ? , 79
Explanation:
The pattern is,
140 + 12 = 152, 152 + 28 = 180
135 – 20 = 115, 115 – 36 = 79
The answer is, 180
24). 101, 113, 119, 125, 134, ?
Explanation:
The pattern is,
The difference is, 12, 6, 6, 9, 18
(ie.,) 12*(1/2) = 6, 6*1 = 6, 6*(3/2) = 9, 9*2 = 18
The answer is, 152
Directions (Q. 1 – 10) Find the wrong term in the following number series.
1). 2, 11, 53, 208, 623
Explanation:
The correct series is, 2, 11, 53, 209, 623
The pattern is, *6 – 1, *5 – 2, *4 – 3, *3 – 4,..
The answer is, 208
2). 50, 39, 53, 35, 56, 32, 59
Explanation:
The correct series is, 50, 39, 53, 35, 56, 31, 59
The pattern is alternative difference,
50 + 3 = 53, 53 + 3 = 56, 56 + 3 = 59,
39 – 4 = 35, 35 – 4 = 31
The answer is, 32
3). 400, 200, 210, 300, 600, 1500, 4500
Explanation:
The correct series is, 400, 200, 200, 300, 600, 1500, 4500
The pattern is, *0.5, *1, *1.5, *2, *2.5, *3
The answer is, 210
4). 11, 5, 4, 4.5, 7, 14, 42
Explanation:
The correct series is, 11, 5, 4, 4.5, 7, 15, 42
The pattern is,
(11-1)*0.5 = 5, (5 – 1)*1 = 4, (4 – 1)*1.5 = 4.5, (4.5 – 1)*2 = 7, (7 – 1)*2.5 = 15, (15 – 1)*3 = 42
The answer is, 14
5). 59, 60, 61, 64, 79, 185, 1129
Explanation:
The correct series is, 59, 60, 61, 64, 79, 184, 1129
The difference is, *1, *3, *5, *7, *9,..
The answer is, 185
6). 26, 27, 34, 58, 106, 186, 306
Explanation:
The correct series is, 26, 26, 34, 58, 106, 186, 306
The difference of difference is, 8, 8, 8, 8,…
The answer is, 27
7). 291, 147, 75, 39, 22, 12, 7.5
Explanation:
The correct series is, 291, 147, 75, 39, 21, 12, 7.5
The pattern is,
(291 + 3)/2 = 147, (147 + 3)/2 = 75, (75 + 3)/2 = 39, (39 + 3)/2 = 21, (21 + 3)/2 = 12, (12 + 3)/2 = 7.5
The answer is, 22
8). 1, 3, 9, 31, 129, 652, 3913
Explanation:
The correct series is, 1, 3, 9, 31, 129, 651, 3913
The pattern is, *1 + 2, *2 + 3, *3 + 4, *4 + 5, *5 + 6, *6 + 7,…
The answer is, 652
 9). 330, 80, 280, 120, 250, 130, 240Â
Explanation:
The correct series is, 330, 80, 280, 120, 250, 140, 240
The pattern is alternative difference,
330 – 50 = 280, 280 – 30 = 250, 250 – 10 = 240
80 + 40 = 120, 120 + 20 = 140
The answer is, 130
10). 4, 12, 21, 55, 110, 326, 375
Explanation:
The correct series is, 4, 12, 21, 85, 110, 326, 375
The pattern is, +23, +32, +43, +52, +63, +72,…
The answer is, 55
