A wrong number series is a grouping of numbers that follow a certain logic or a mathematical formula. In IBPS PO, SO, SBI Clerk, SBI SO exams the questions on Wrong Number Series are very frequent. They are mostly present in the quantitative section and have a few types of questions. A number series is a string of numbers that are connected with the help of a discrete rule. By this, we mean that in a number series, you will see a few numbers all of whom can be calculated if you know the rule. In Bank and insurance exams these questions are based on numerical sequences that follow a logical rule/ pattern based on elementary arithmetic concepts. A particular series is given from which the pattern must be analyzed. You are then asked to predict the next number in the sequence following the same rule. A numerical series is given in which a number is wrongly placed. You are asked to identify that particular wrong number. A complete numerical series is followed by an incomplete numerical series. You need to solve that incomplete numerical series in the same pattern in which the complete numerical series is given.
Dear Aspirants, Our IBPS Guide team is providing new series of quantitive Questions for IBPS Clerk Mains so the aspirants can practice it on a daily basis. These questions are framed by our skilled experts after understanding your needs thoroughly. Aspirants can practice these new series of questions daily to familiarize themselves with the exact exam pattern and make their preparation effective.
1) What is called the wrong number series?
Ans. A number series is a grouping of numbers that follow a certain logic or a mathematical formula.
2) How To Find A Missing Number In a Sequence?
Ans. Identity, if the order of number given is ascending ( smaller to larger number) or descending ( larger to smaller number). Calculate the differences between those that are next to each other. Estimate the difference between numbers to calculate the missing number.
Directions (01-10): Find out the wrong number in the following number series.
1) 3, 12, 54, 270, 1485, 8920
A.270
B.8920
C.54
D.12
E.1485
2) 339, 341, 345, 353, 369, 400
A.400
B.341
C.345
D.353
E.339
3) 96, 420, 131, 385, 162, 358
A.385
B.162
C.420
D.358
E.131
4) 100, 115, 150, 190, 250, 325
A.100
B.115
C.150
D.190
E.250
5) 9, 1, 25, 81, 169, 361
A.169
B.1
C.81
D.361
E.25
6) 75, 125, 170, 210, 245, 295
A.245
B.170
C.210
D.125
E.295
7) 15, 9, 6, 0, -24, -148
A.15
B.0
C.6
D.-148
E.9
8) 65.5, 65.8, 66.1, 67, 71.5, 101.5
A.71.5
B.67
C.65.5
D.101.5
E.66.1
9) 12, 20, 36, 60, 92, 136
A.92
B.136
C.20
D.60
E.36
10) 29, 40, 44, 52, 62, 73
A.73
B.44
C.62
D.40
E.52
Answers :
1) Answer: B
3 * 4 = 12
12 * 4.5 = 54
54 * 5 = 270
270 * 5.5 = 1485
1485 * 6 = 8910
2) Answer: A
339 + 21 = 341
341 + 22 = 345
345 + 23 = 353
353 + 24 = 369
369 + 25 = 401
3) Answer: A
96 + 182 = 420
420 – 172 = 131
131 + 162 = 387
387 – 152 = 162
162 + 142 = 358
4) Answer: C
100 + 15 * 1 = 115
115 + 15 * 2 = 145
145 + 15 * 3 = 190
190 + 15 * 4 = 250
250 + 15 * 5 = 325
5) Answer: D
(-3)2 = 9
12 = 1
52 = 25
92 = 81
132 = 169
172 = 289
6) Answer: E
75 + 50 = 125
125 + 45 = 170
170 + 40 = 210
210 + 35 = 245
245 + 30 = 275
7) Answer: D
15 x 1 – 6 = 9
9 x 2 -12 = 6
6 x 3 – 18 = 0
0 x 4 – 24 = -24
-24 x 5 – 30 = -150
8) Answer: D
65.5 65.8 66.1 67 71.5 103
+0.3 +0.3 +0.9 +4.5 +31.5
X1 X3 X5 X7
9) Answer: B
12 + 8 = 20
20 + 16 = 36
36 + 24 = 60
60 + 32 = 92
92 + 40 = 132
10) Answer: C
29 + (2 + 9) = 40
40 + (4 + 0) = 44
44 + (4 + 4) = 52
52 + (5 + 2) = 59
59 + (5 + 9) = 73
Directions (11-20): Find out the wrong number in the following number series.
11) 12, 26, 44, 64, 92, 122
A.122
B.92
C.64
D.44
E.26
12) 152, 76, 90, 114, 228,570
A.76
B.114
C.570
D.90
E.228
13) 5, 30, -6, 44, -21, 60
A.5
B.30
C.-6
D.44
E.-21
14) 10, 14, 41, 58, 182, 218
A.10
B.14
C.41
D.58
E.182
15) 10, 18, -9, 55, -70, 147
A.147
B.-70
C.55
D.-9
E.18
16) 251, 276, 257, 271, 261, 266
A.251
B.276
C.257
D.271
E.261
17) 28, 35, 42, 70, 98, 133
A.35
B.42
C.70
D.98
E.28
18) 7, 15, 80, 295, 807, 1807
A.7
B.15
C.80
D.295
E.807
19) 20, 22, 47, 145, 585, 2920
A.2920
B.145
C.585
D.47
E.None of these
20) 80640, 10080, 1440, 240, 44, 12
A.12
B.10080
C.1440
D.44
E.240
Answers :
11) Answer: C
12 + 14 = 26
26 + 18 = 44
44 + 22 = 66
66 + 26 = 92
92 + 30 = 122
12) Answer: D
152 * 0.5 = 76
76 * 1 = 76
76 * 1.5 = 114
114 * 2 = 228
228 * 2.5 = 570
13) Answer: D
5 + 52 = 30
30 – 62 = -6
-6 + 72 = 43
43 – 82 = -21
-21 + 92 = 60
14) Answer: D
10 + 22 = 14
14 + 33 = 41
41 + 42 = 57
57 + 53 = 182
182 + 62 = 218
15) Answer: A
10 + 23 = 18
18 – 33 = -9
-9 + 43 = 55
55 – 53 = -70
-70 + 63 = 146
16) Answer: C
251 + 25 = 276
276 – 20 = 256
256 + 15 = 271
271 – 10 = 261
261 + 5 = 266
17) Answer: B
28 + 7 = 35
35 + 14 = 49
49 + 21 = 70
70 + 28 = 98
98 + 35 = 133
18) Answer: C
7 + 23 = 15
15 + 43 = 79
79 + 63 = 295
295 + 83 = 807
807 + 103 = 1807
19) Answer: A
20 * 1 + 2 = 22
22 * 2 + 3 = 47
47 * 3 + 4 = 145
145 * 4 + 5 = 585
585 * 5 + 6 = 2931
20) Answer: D
80640 ÷ 8 = 10080
10080 ÷ 7 = 1440
1440 ÷ 6 = 240
240 ÷ 5 = 48
48 ÷ 4 = 12
Directions (21-30): Find the wrong term in the following number series?
21) 327, 326, 162, 53.5, 12.25
A.326
B.162
C.12.25
D.53.5
E.327
22) 2, 4, 12, 48, 248, 1440
A.48
B.12
C.248
D.1440
E.4
23) 244, 243, 234, 209, 160, 78
A.243
B.234
C.78
D.160
E.209
24) 7, 25, 60, 115, 187, 277
A.187
B.277
C.25
D.60
E.115
25) 45, 101, 143, 175, 193, 205
A.101
B.205
C.175
D.193
E.143
26) 117, 198, 710, 760, 975, 1000
A.710
B.1000
C.975
D.760
E.198
27) 32, 45, 71, 110, 162, 225
A.45
B.225
C.110
D.162
E.71
28) 120, 180, 450, 650, 1687.5, 2531.25
A.650
B.180
C.1687.5
D.450
E.2531.25
29) 117, 135, 157, 180, 205, 232
A.157
B.180
C.205
D.135
E.232
30) 97, 110, 136, 175, 227, 290
A.290
B.175
C.110
D.227
E.136
Answers :
21) Answer: D
The pattern is,
(327 – 1)/1 = 326
(326 – 2)/2 = 162
(162 – 3)/3 = 53
(53 – 4)/4 = 12.25
22) Answer: C
2 * 1 + 2=4
4 * 2 + 4=12
12 * 3 + 12=48
48 * 4 + 48=240
240 * 5 + 240=1440
23) Answer: C
244 – 12 = 243
243 – 32 =234
234 – 52 =209
209 – 72 =160
160 – 92 =79
24) Answer: D
7 + 18=25
25 + 36=61
61 + 54=115
115 + 72=187
187 + 90=277
25) Answer: C
45 + (82 – 8) = 101
101 + (72 – 7) = 143
143 + (62 – 6) = 173
173 + (52 – 5) = 193
193 + (42 – 4) = 205
26) Answer: D
117 + 92 =198
198 + 83 =710
710 + 72 = 759
759 + 63 =975
975 + 52 =1000
27) Answer: B
32 45 71 110 162 227
13 26 39 52 65
13 13 13 13
28) Answer: A
120 * 1.5 = 180
180 * 2.5 = 450
450 * 1.5 = 675
675 * 2.5 = 1687.5
1687.5 * 1.5 = 2531.25
29) Answer: D
117 + 19 = 136
136 + 21 = 157
157 + 23 = 180
180 + 25 = 205
205 + 27 = 232
30) Answer: A
97 + (13 * 1)=110
110 + (13 * 2)=136
136 + (13 * 3)=175
175 + (13 * 4)=227
227 + (13 * 5)=292
Directions (31-40): Find out the wrong number in the following number series.
31) 1333, 1731, 2201, 2749, 3378
A.1333
B.2201
C.1731
D.3378
E.2749
32) 321, 316, 324, 309, 329, 306
A.324
B.326
C.303
D.321
E.309
33) 23, 46, 92, 161, 252, 368
A.46
B.161
C.252
D.92
E.268
34) 27, 54, 162, 448, 3240, 19440
A.54
B.3240
C.162
D.448
E.19440
35) 152, 180, 289, 448, 630, 822
A.448
B.630
C.152
D.289
E.822
36) 51, 25, 26, 37, 77, 190, 573
A.190
B.573
C.51
D.37
E.77
37) 11, 14, 34, 113, 456, 2295
A.456
B.113
C.11
D.2295
E.34
38) 528, 638, 770, 926, 1104, 1318
A.528
B.770
C.1104
D.1318
E.926
39) 19, 235, 260, 324, 335, 341
A.341
B.19
C.235
D.335
E.260
40) 12, 22, 64, 220, 928, 4690
A.220
B.928
C.4690
D.22
E.64
Answers :
31) Answer: D
11³ + 2 = 1333
12³ + 3 = 1731
13³ + 4 = 2201
14³ + 5 = 2749
15³ + 6 = 3381
32) Answer: E
321 – 5 = 316
316 + 8 = 324
324 – 12 = 312
309 + 17 = 329
329 – 23 = 306
33) Answer: C
23 + 23 * 1 = 46
46 + 23 * 2 = 92
92 + 23 * 3 = 161
161 + 23 * 4 = 253
253 + 23 * 5 = 368
34) Answer: D
27 * 1 = 27
27 * 2 = 54
54 * 3 = 162
162 * 4 = 648
648 * 5 = 3240
3240 * 6 = 19440
35) Answer: A
The correct series is,
152 180 289 447 630 822
28 109 158 183 192
81 49 25 9
The difference of difference is, 92, 72, 52, 32,….
The wrong term is, 448
36) Answer: D
51*0.5-0.5=25
25*1+1=26
26*1.5-1.5=37.5
37.5*2+2=77
77*2.5-2.5=190
190*3+3=573
37) Answer: B
11*1+3=14
14*2+6=34
34*3+9=111
111*4+12=456
456*5+15=2295
38) Answer: C
528+112 – 11=638
638+122 – 12=770
770+132 – 13=926
926+142 – 14=1108
1108+152 – 15=1318
39) Answer: D
19 + 63 = 235
235 + 52 = 260
260 + 43 = 324
324 + 32 = 333
333 + 23 = 341
40) Answer: A
12 * 1 + 10 = 22
22 * 2 + 20 = 64
64 * 3 + 30 = 222
222 * 4 + 40 = 928
928 * 5 + 50 = 4690
Directions (41-50): Find the wrong term in the following number of series?
41) 14 8 14 37 137
A.14
B.137
C.37
D.8
E.None of these
42) 4 20 30 72 90 156
A.30
B.4
C.156
D.72
E.90
43) 11 13 19 34 62 116
A.11
B.19
C.34
D.116
E.None of these
44) 17 35 71 143 288 575
A.288
B.17
C.575
D.143
E.None of these
45) 22 24 30 60 116 250
A.24
B.22
C.116
D.250
E.None of these
46) 49 50 46 55 39 64 29
A.49
B.55
C.39
D.50
E.29
47) 8 7 9 16 37.5 108.5
A.8
B.7
C.9
D.37.5
E.None of these
48) 107 206 286 349 397 428 456
A.206
B.428
C.349
D.456
E.397
49) 27 40 66 105 157 222 305
A.222
B.105
C.66
D.40
E.305
50) 29 142 259 364 435 444 472
A.435
B.472
C.444
D.142
E.259
Answers :
41) Answer: C
14 * 0.5 + 1 = 8
8 * 1.5 +2 =14
14 * 2.5 +3 = 38
38 * 3.5 +4 =137
42) Answer: B
2² – 2 = 2
4² + 4 = 20
6² – 6 = 30
8² + 8 = 72
10² – 10 = 90
12² + 12 = 156
43) Answer: D
11 + 2 x 1 = 13 (consecutive prime numbers multiply with natural no.)
13 + 3 x 2 = 19
19 + 5 x 3 = 34
34 + 7 x 4 = 62
62 + 11 x 5 = 117
44) Answer: A
17 + 18 x 1 = 35
35 + 18 x 2 = 71
71 + 18 x 4 = 143
143 + 18 x 8 = 287
287 + 18 x 16 = 575
45) Answer: C
22 + (1³ + 1) = 24
24 + (2³ – 2) = 30
30 + (3³ + 3) = 60
60 + (4³ – 4) = 120
120 + (5³ + 5) = 250
46) Answer: E
49+1²= 50
50-2²= 46
46+3²= 55
55-4²= 39
39+5²= 64
64-6²= 28
47) Answer: E
(8 – 1) x 1 = 7
(7 – 1) x 1.5 = 9
(9 – 1) x 2 = 16
(16 – 1) x 2.5 = 37.5
(37.5 – 1) x 3 = 109.5
48) Answer: B
107 + (9 × 11) = 206
206 + (8 × 10) = 286
286 + (7 × 9) = 349
349 + (6 × 8) = 397
397 + (5 × 7) = 432
432 + (4 × 6) = 456
49) Answer: E
27 + 13 = 40
40 + 26 = 66
66 + 39 = 105
105 + 52 = 157
157 + 65 = 222
222 + 78 = 300
50) Answer: B
29 + (112 – 23) = 142
142 + (122 – 33) = 259
259 + (132 – 43) = 364
364 + (142 – 53) = 435
435 + (152 – 63) = 444
444 + (162 – 73) = 357
This post was last modified on September 21, 2023 6:25 pm