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All questions of Number Series for Bank Exams Exam
8, 9, 15, 32, ?, 250.5- a)82.5
- b)47.5
- c)62.5
- d)37.5
- e)64.5
Correct answer is option 'A'. Can you explain this answer?
8, 9, 15, 32, ?, 250.5
a)
82.5
b)
47.5
c)
62.5
d)
37.5
e)
64.5
|
Naroj Boda answered |
8 * 1 + 1 = 9
9 * 1.5 + 1.5= 15
15 * 2 + 2 = 32
32 * 2.5 + 2.5 = 82.5
82.5 * 3 + 3 = 250.5
9 * 1.5 + 1.5= 15
15 * 2 + 2 = 32
32 * 2.5 + 2.5 = 82.5
82.5 * 3 + 3 = 250.5
32, ?, 1024, 2048, 2048- a)324
- b)256
- c)224
- d)326
- e)274
Correct answer is option 'B'. Can you explain this answer?
32, ?, 1024, 2048, 2048
a)
324
b)
256
c)
224
d)
326
e)
274
|
Cstoppers Instructors answered |
32 * 8 = 256
256 * 4 = 1024
1024 * 2 = 2048
2048*1 = 2048
256 * 4 = 1024
1024 * 2 = 2048
2048*1 = 2048
2, 2, 7, ?, 87, 342- a)21
- b)26
- c)23
- d)24
- e)22
Correct answer is option 'E'. Can you explain this answer?
2, 2, 7, ?, 87, 342
a)
21
b)
26
c)
23
d)
24
e)
22
|
Anaya Patel answered |
2 + 1² – 1 = 2
2 + 2² + 1= 7
7 + 4² – 1= 22
2 + 2² + 1= 7
7 + 4² – 1= 22
1, 20, 58, 134, 286, ?- a)600
- b)590
- c)580
- d)570
- e)560
Correct answer is option 'B'. Can you explain this answer?
1, 20, 58, 134, 286, ?
a)
600
b)
590
c)
580
d)
570
e)
560
|
Nikita Singh answered |
1 * 2 + 18 = 20
20 * 2 + 18 = 58
58 * 2 + 18 = 134
134 * 2 + 18 = 286
20 * 2 + 18 = 58
58 * 2 + 18 = 134
134 * 2 + 18 = 286
7, 7, 13, 37, 97, ?- a)237
- b)247
- c)217
- d)227
- e)257
Correct answer is option 'C'. Can you explain this answer?
7, 7, 13, 37, 97, ?
a)
237
b)
247
c)
217
d)
227
e)
257
|
|
Cstoppers Instructors answered |
7 + 1³ – 1 = 7
7 + 2³ – 2 = 13
13 + 3³ – 3 = 37
7 + 2³ – 2 = 13
13 + 3³ – 3 = 37
2, 5, 9, 42, 98, ?- a)233
- b)218
- c)221
- d)225
- e)242
Correct answer is option 'A'. Can you explain this answer?
2, 5, 9, 42, 98, ?
a)
233
b)
218
c)
221
d)
225
e)
242
|
Shailendra Singh answered |
2 + 1³ + 2 = 5
5 + 2³ – 4 = 9
9 + 3³ + 6 = 42
42 + 4³ – 8 = 98
98 + 5³ + 10 = 233
5 + 2³ – 4 = 9
9 + 3³ + 6 = 42
42 + 4³ – 8 = 98
98 + 5³ + 10 = 233
6, 8, 8, 22, ?, 151- a)43
- b)42
- c)44
- d)47
- e)48
Correct answer is option 'D'. Can you explain this answer?
6, 8, 8, 22, ?, 151
a)
43
b)
42
c)
44
d)
47
e)
48
|
Bank Exams India answered |
6 * 1 + 2 = 8
8 * 1.5 – 4 = 8
8 * 2 + 6 = 22
22 * 2.5 – 8 = 47
47 * 3 + 10 = 151
8 * 1.5 – 4 = 8
8 * 2 + 6 = 22
22 * 2.5 – 8 = 47
47 * 3 + 10 = 151
4, 15, 63, 247, 995, ?- a)3975
- b)3973
- c)3965
- d)3971
- e)3955
Correct answer is option 'D'. Can you explain this answer?
4, 15, 63, 247, 995, ?
a)
3975
b)
3973
c)
3965
d)
3971
e)
3955
|
Divey Sethi answered |
4 * 4 – 1 = 15
15 * 4 + 3 = 63
63 * 4 – 5 = 247
247 * 4 + 7 = 995
995 * 4 – 9 = 3971
15 * 4 + 3 = 63
63 * 4 – 5 = 247
247 * 4 + 7 = 995
995 * 4 – 9 = 3971
3, 11, 47, 183, ?, 2947- a)775
- b)770
- c)765
- d)783
- e)739
Correct answer is option 'E'. Can you explain this answer?
3, 11, 47, 183, ?, 2947
a)
775
b)
770
c)
765
d)
783
e)
739
|
|
Aisha Gupta answered |
3 * 4 – 1 = 11
11 * 4 + 3 = 47
47 * 4 – 5 = 183
183 * 4 + 7 = 739
739 * 4 – 9 = 2947
11 * 4 + 3 = 47
47 * 4 – 5 = 183
183 * 4 + 7 = 739
739 * 4 – 9 = 2947
9, 8, 15, ?, 175, 874- a)42
- b)24
- c)38
- d)44
- e)14
Correct answer is option 'D'. Can you explain this answer?
9, 8, 15, ?, 175, 874
a)
42
b)
24
c)
38
d)
44
e)
14
|
Preeti Khanna answered |
9*1 – 1 = 8
8*2 – 1 = 15
15*3 – 1 = 44
8*2 – 1 = 15
15*3 – 1 = 44
4, 5, 6, 14, ?, 100.5- a)32.5
- b)47.5
- c)67.5
- d)37.5
- e)27.5
Correct answer is option 'A'. Can you explain this answer?
4, 5, 6, 14, ?, 100.5
a)
32.5
b)
47.5
c)
67.5
d)
37.5
e)
27.5
|
|
Nikita Singh answered |
4 * 1 + 1 = 5
5 * 1.5 – 1.5= 6
6 * 2 + 2 = 14
14 * 2.5 – 2.5 = 32.5
32.5 * 3 + 3 = 100.5
5 * 1.5 – 1.5= 6
6 * 2 + 2 = 14
14 * 2.5 – 2.5 = 32.5
32.5 * 3 + 3 = 100.5
12 7 9 22 96 ?- a)754
- b)784
- c)794
- d)734
- e)744
Correct answer is option 'B'. Can you explain this answer?
12 7 9 22 96 ?
a)
754
b)
784
c)
794
d)
734
e)
744
|
|
Aisha Gupta answered |
12 * 0.5 + 1 = 7
7 * 1 + 2 = 9
9 * 2 + 4 = 22
22 * 4 + 8 = 96
96 * 8 + 16 = 784
7 * 1 + 2 = 9
9 * 2 + 4 = 22
22 * 4 + 8 = 96
96 * 8 + 16 = 784
5, ?, 20, 34, 76, 142- a)4
- b)5
- c)7
- d)8
- e)9
Correct answer is option 'D'. Can you explain this answer?
5, ?, 20, 34, 76, 142
a)
4
b)
5
c)
7
d)
8
e)
9
|
|
Aryan Khanna answered |
5x2-2 = 8
8x2+4 = 20
20x2-6 = 34
34x2+8 = 76
76x2-10 = 142
17, 98, 26, ?, 35, 80
- a)79
- b)69
- c)89
- d)59
- e)49
Correct answer is option 'C'. Can you explain this answer?
17, 98, 26, ?, 35, 80
a)
79
b)
69
c)
89
d)
59
e)
49
|
Quantronics answered |
26 -17 = 9; 35 – 26 = 9
98 – 9 = 89
98 – 9 = 89
7, 4.5 ,5.5, 12, 49,?- a)393
- b)351
- c)362
- d)375
- e)364
Correct answer is option 'A'. Can you explain this answer?
7, 4.5 ,5.5, 12, 49,?
a)
393
b)
351
c)
362
d)
375
e)
364
|
|
Naroj Boda answered |
7 × 0.5 + 1 = 4.5.
4.5 × 1 + 1 = 5.5.
5.5 × 2 + 1 = 12.
12 × 4 + 1 = 49.
49 × 8 + 1 = 393.
4.5 × 1 + 1 = 5.5.
5.5 × 2 + 1 = 12.
12 × 4 + 1 = 49.
49 × 8 + 1 = 393.
2, 5, 17, 50, 122, ?- a)252
- b)258
- c)257
- d)225
- e)242
Correct answer is option 'C'. Can you explain this answer?
2, 5, 17, 50, 122, ?
a)
252
b)
258
c)
257
d)
225
e)
242
|
Yash Patel answered |
2 + 1³ + 2 = 5
5 + 2³ + 4 = 17
17 + 3³ + 6 = 50
50 + 4³ + 8 = 122
5 + 2³ + 4 = 17
17 + 3³ + 6 = 50
50 + 4³ + 8 = 122
7, ?, 19, 45, 95, 177- a)8
- b)5
- c)6
- d)7
- e)9
Correct answer is option 'E'. Can you explain this answer?
7, ?, 19, 45, 95, 177
a)
8
b)
5
c)
6
d)
7
e)
9
|
|
Preeti Khanna answered |
7 + 1² + 1= 9
9 + 3² + 1= 19
19 + 5² + 1= 45……..
9 + 3² + 1= 19
19 + 5² + 1= 45……..
8 4 4 8 32 ?- a)354
- b)384
- c)294
- d)234
- e)256
Correct answer is option 'E'. Can you explain this answer?
8 4 4 8 32 ?
a)
354
b)
384
c)
294
d)
234
e)
256
|
Future Foundation Institute answered |
8 * 0.5 = 4
4 * 1 = 4
4 * 2 = 8
8 * 4 = 32
32 * 8 = 256
4 * 1 = 4
4 * 2 = 8
8 * 4 = 32
32 * 8 = 256
3, 5, 15, 45, 113, ?- a)253
- b)263
- c)243
- d)651
- e)655
Correct answer is option 'C'. Can you explain this answer?
3, 5, 15, 45, 113, ?
a)
253
b)
263
c)
243
d)
651
e)
655
|
Arya Roy answered |
Sub-series formed by the difference between consecutive terms is 2, 10, 30 and 68.
This sub-series follows the below pattern.
1^3 + 1, 2^3 + 2, 3^3 + 3 and 4^3 + 4.
So the next term of the difference sub-series will be 5^3 + 5 = 130. Final answer will be 113 + (5^3 + 5) = 113 + 130 = 243.
Hence answer is 243.
below is a detailed representation of the entire series.
3 + (1^3 + 1) = 3 + 2 = 5
5 + (2^3 + 2) = 5 + 10 = 15
15 + (3^3 + 3) = 15 + 30 = 45
45 + (4^3 + 4) = 45 + 68 = 113
113 + (5^3 + 5) = 113+130 = 243.
9, 5, 6, 10.5, 23 ?- a)50
- b)65
- c)70
- d)55
- e)60
Correct answer is option 'E'. Can you explain this answer?
9, 5, 6, 10.5, 23 ?
a)
50
b)
65
c)
70
d)
55
e)
60
|
|
Divey Sethi answered |
9 * 0.5 + 0.5 = 5
5 * 1 + 1 = 6
6 * 1.5 + 1.5 = 10.5
10.5 * 2 + 2 = 23
23 * 2.5 + 2.5 = 60
5 * 1 + 1 = 6
6 * 1.5 + 1.5 = 10.5
10.5 * 2 + 2 = 23
23 * 2.5 + 2.5 = 60
2, 4, 7, ?, 87, 344- a)38
- b)24
- c)56
- d)44
- e)62
Correct answer is option 'B'. Can you explain this answer?
2, 4, 7, ?, 87, 344
a)
38
b)
24
c)
56
d)
44
e)
62
|
|
Divey Sethi answered |
2 + 1² + 1 = 4
4 + 2² – 1 = 7
7 + 4² + 1 = 24
24 + 8² – 1 = 87
87 + 16² + 1 = 344
4 + 2² – 1 = 7
7 + 4² + 1 = 24
24 + 8² – 1 = 87
87 + 16² + 1 = 344
5, 6, 10, 33, 128, ?- a)645
- b)680
- c)650
- d)690
- e)620
Correct answer is option 'A'. Can you explain this answer?
5, 6, 10, 33, 128, ?
a)
645
b)
680
c)
650
d)
690
e)
620
|
|
Bank Exams India answered |
5 * 1 + 1 = 6
6 * 2 – 2 = 10
10 * 3 + 3 = 33
33 * 4 – 4 = 128
128 * 5 + 5 = 645
6 * 2 – 2 = 10
10 * 3 + 3 = 33
33 * 4 – 4 = 128
128 * 5 + 5 = 645
2, 2, 12, 36, 104, ?- a)232
- b)221
- c)223
- d)224
- e)242
Correct answer is option 'D'. Can you explain this answer?
2, 2, 12, 36, 104, ?
a)
232
b)
221
c)
223
d)
224
e)
242
|
|
Cstoppers Instructors answered |
2 + 1³ – 1 = 2
2 + 2³ + 2 = 12
12 + 3³ – 3 = 36
36 + 4³ + 4 = 104
2 + 2³ + 2 = 12
12 + 3³ – 3 = 36
36 + 4³ + 4 = 104
68, 117, 61, 124, 54, ?- a)141
- b)121
- c)151
- d)131
- e)111
Correct answer is option 'D'. Can you explain this answer?
68, 117, 61, 124, 54, ?
a)
141
b)
121
c)
151
d)
131
e)
111
|
|
Preeti Khanna answered |
68 – 7 = 61; 61 – 7 = 54
124 + 7 = 131
124 + 7 = 131
4, ?, 14, 40, 88, 170- a)9
- b)5
- c)6
- d)7
- e)2
Correct answer is option 'C'. Can you explain this answer?
4, ?, 14, 40, 88, 170
a)
9
b)
5
c)
6
d)
7
e)
2
|
Ravi Singh answered |
4 + 1² + 1 = 6
6 + 3² – 1 = 14
14 + 5² + 1 = 40
40 + 7² – 1 = 88
88 + 9² + 1 = 170
6 + 3² – 1 = 14
14 + 5² + 1 = 40
40 + 7² – 1 = 88
88 + 9² + 1 = 170
3, 5, ?, 27, 92, 349- a)12
- b)18
- c)15
- d)10
- e)11
Correct answer is option 'D'. Can you explain this answer?
3, 5, ?, 27, 92, 349
a)
12
b)
18
c)
15
d)
10
e)
11
|
|
Cstoppers Instructors answered |
3 + 1² + 1 = 5
5 + 2² + 1= 10
10 + 4² + 1= 27
5 + 2² + 1= 10
10 + 4² + 1= 27
6, 4, 10, 14, 43, ?- a)119
- b)127
- c)114
- d)141
- e)132
Correct answer is option 'A'. Can you explain this answer?
6, 4, 10, 14, 43, ?
a)
119
b)
127
c)
114
d)
141
e)
132
|
Target Study Academy answered |
6 * 1 – 2 = 4
4 * 1.5 + 4 = 10
10 * 2 – 6 = 14
14 * 2.5 + 8 = 43
43 * 3 – 10 = 119
4 * 1.5 + 4 = 10
10 * 2 – 6 = 14
14 * 2.5 + 8 = 43
43 * 3 – 10 = 119
6, 6, 7, ?, 91, 463- a)33
- b)43
- c)38
- d)25
- e)44
Correct answer is option 'D'. Can you explain this answer?
6, 6, 7, ?, 91, 463
a)
33
b)
43
c)
38
d)
25
e)
44
|
|
Aisha Gupta answered |
Ans.
Option (d)
6*1 – 1 + 1 = 6
6*2 – 2 – 3 = 7
7*3 – 1 + 5 = 25
25*4 – 2 – 7 = 91
91*5 – 1 + 9 = 463
6*2 – 2 – 3 = 7
7*3 – 1 + 5 = 25
25*4 – 2 – 7 = 91
91*5 – 1 + 9 = 463
6, 6, 7, ?, 91, 463- a)33
- b)43
- c)38
- d)25
- e)44
Correct answer is option 'D'. Can you explain this answer?
6, 6, 7, ?, 91, 463
a)
33
b)
43
c)
38
d)
25
e)
44
|
|
Ravi Singh answered |
6*1 – 1 + 1 = 6
6*2 – 2 – 3 = 7
7*3 – 1 + 5 = 25
25*4 – 2 – 7 = 91
91*5 – 1 + 9 = 463
6*2 – 2 – 3 = 7
7*3 – 1 + 5 = 25
25*4 – 2 – 7 = 91
91*5 – 1 + 9 = 463
2, 9, 39, 161, ?, 2613- a)675
- b)670
- c)665
- d)651
- e)655
Correct answer is option 'D'. Can you explain this answer?
2, 9, 39, 161, ?, 2613
a)
675
b)
670
c)
665
d)
651
e)
655
|
KS Coaching Center answered |
2 * 4 + 1 = 9
9 * 4 + 3 = 39
39 * 4 + 5 = 161
161 * 4 + 7 = 651
651 * 4 + 9 = 2613
9 * 4 + 3 = 39
39 * 4 + 5 = 161
161 * 4 + 7 = 651
651 * 4 + 9 = 2613
4, 6, 8, 30, 112, ?- a)540
- b)580
- c)550
- d)590
- e)570
Correct answer is option 'E'. Can you explain this answer?
4, 6, 8, 30, 112, ?
a)
540
b)
580
c)
550
d)
590
e)
570
|
|
Bank Exams India answered |
4 * 1 + 2 = 6
6 * 2 – 4 = 8
8 * 3 + 6 = 30
30 * 4 – 8 = 112
112 * 5 + 10 = 570
6 * 2 – 4 = 8
8 * 3 + 6 = 30
30 * 4 – 8 = 112
112 * 5 + 10 = 570
2, ?, 8, 10, 28, 46- a)2
- b)5
- c)7
- d)8
- e)9
Correct answer is option 'A'. Can you explain this answer?
2, ?, 8, 10, 28, 46
a)
2
b)
5
c)
7
d)
8
e)
9
|
|
Anaya Patel answered |
2*2 – 2 = 2
2*2 + 4 = 8
8*2 – 6 = 10
10*2 + 8 = 28
28*2 – 10 = 46
2*2 + 4 = 8
8*2 – 6 = 10
10*2 + 8 = 28
28*2 – 10 = 46
4, 4, 6, 12, 30, ?- a)97
- b)92
- c)95
- d)98
- e)90
Correct answer is option 'E'. Can you explain this answer?
4, 4, 6, 12, 30, ?
a)
97
b)
92
c)
95
d)
98
e)
90
|
|
Rajeev Kumar answered |
4 * 1 = 4
4 * 1.5 = 6
6 * 2 = 12
12 * 2.5 = 30
30 * 3 = 90
4 * 1.5 = 6
6 * 2 = 12
12 * 2.5 = 30
30 * 3 = 90
1, 2, 6, 17, ?, 157.5- a)40.5
- b)42.5
- c)49.5
- d)51.5
- e)50.5
Correct answer is option 'C'. Can you explain this answer?
1, 2, 6, 17, ?, 157.5
a)
40.5
b)
42.5
c)
49.5
d)
51.5
e)
50.5
|
|
Yash Patel answered |
1 * 1 + 1 = 2
2* 1.5 + 3 = 6
6 * 2 + 5 = 17
17 * 2.5 + 7 = 49.5
49.5 * 3 + 9 =157.5
2* 1.5 + 3 = 6
6 * 2 + 5 = 17
17 * 2.5 + 7 = 49.5
49.5 * 3 + 9 =157.5
4, ?, 14, 40, 88, 170- a)9
- b)5
- c)6
- d)7
- e)2
Correct answer is option 'C'. Can you explain this answer?
4, ?, 14, 40, 88, 170
a)
9
b)
5
c)
6
d)
7
e)
2
|
|
Bank Exams India answered |
4 + 1² + 1= 6
6 + 3² – 1= 14
14 + 5² + 1= 40
6 + 3² – 1= 14
14 + 5² + 1= 40
3.25, 6.5, 19.5, 78, 390, ?- a)2140
- b)2350
- c)2670
- d)2340
- e)2250
Correct answer is option 'D'. Can you explain this answer?
3.25, 6.5, 19.5, 78, 390, ?
a)
2140
b)
2350
c)
2670
d)
2340
e)
2250
|
|
Nikita Singh answered |
3.25 * 2 = 6.5
6.5 * 3 = 19.5
19.5 * 4 = 78
6.5 * 3 = 19.5
19.5 * 4 = 78
6, 8, 12, 42, 160, ?- a)870
- b)840
- c)850
- d)810
- e)820
Correct answer is option 'D'. Can you explain this answer?
6, 8, 12, 42, 160, ?
a)
870
b)
840
c)
850
d)
810
e)
820
|
|
Aarav Sharma answered |
6 * 1 + 2 = 8
8 * 2 – 4 = 12
12 * 3 + 6 = 42
42 * 4 – 8 = 160
160 * 5 + 10 = 810
3, ?, 7, 9, 11, 13- a)6
- b)5
- c)7
- d)8
- e)9
Correct answer is option 'B'. Can you explain this answer?
3, ?, 7, 9, 11, 13
a)
6
b)
5
c)
7
d)
8
e)
9
|
|
Bank Exams India answered |
3*2 – 1 = 5
5*2 – 3 = 7
7*2 – 5 = 9
5*2 – 3 = 7
7*2 – 5 = 9
What should come in place of the question mark '?' in the following number series?
10, 5, ?, 10, 40, 320
- a)2
- b)5
- c)3
- d)6.5
- e)1
Correct answer is option 'B'. Can you explain this answer?
What should come in place of the question mark '?' in the following number series?
10, 5, ?, 10, 40, 320
10, 5, ?, 10, 40, 320
a)
2
b)
5
c)
3
d)
6.5
e)
1
|
|
Rajeev Kumar answered |
The given number series follows the pattern:
10 × 2-1 = 5
5 × 20 = 5
5 × 21 = 10
10 × 22 = 40
40 × 23 = 320
∴ The number coming in place of “?” in the given number series is 5
Chapter doubts & questions for Number Series - RBI Assistant Preparation Course 2025 is part of Bank Exams exam preparation. The chapters have been prepared according to the Bank Exams exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Bank Exams 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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