Number series Questions for IBPS PO Pre, SBI PO Pre, IBPS Clerk Mains and SBI Clerk Mains Exams.

 Number series

Directions : What will come in place of question mark (?) in the following series?

1. 4 18      85      336      1005      ?
   A.1680 B. 1850 C. 2080  D. 2008   E. 1901

 

2.      9      265      393      457      489      ?

 A.  550 B. 505 C. 595    D. 575     E. 525

 

3.	7	17	35	63	103	?
A.109	B. 157	C. 186	D. 212		E. 172
4.   A.7456	40   B.6583	82   C.8757	249   D. 3423		1250   E.8134	?
5. A. 549	24 B. 549	70 C. 495	144 D. 594		252 E. 525	400	?
6. A. 84	33 B. 85	47 C. 83	53 D. 81		61 E. None of the above	71	?
7. A. 116	660 B. 56	656 C. 1	620 D. 0		520 E. None of these	324	?
8. A. 980	133 B. 982	207 C. 984	353 D. 987		501 D. 987	741 E.995	?
9. A. 47.5	8.5 B. 48.5	24 C.49.5	79 D. 50.5		118.5 E. None of these		166	?

 

10.	2048      516				1032	262		?	135		270
A.532	B.444	C.464	D.524	E. None of these
11. A.128	7 B.190	9 C.172	48 C. 172	? D.168	890 E. None of these
12. A.108	47 B.107	58 C.105	71 D.109	79 E. None of the above	95	?
13.	8	39		79	394	789		?

1. 2149 B. 3542 C. 2862   D. 3944   E. None of these

 

14.    15      17      26      47      86      ?

1. 132 B. 149 C. 169   D. 172  E. 152

 

15.    3    9     24     57     ?     267     552

1. 121 B. 118 C. 114  D. 126   E. None of these

 

16.    2      8       28        102         432       ?

1. 1860 B. 1296 C. 2190    D. 2490     E. None of these

 

17.   6   16    44    126    370 ?

A.1100 B. 1050 C. 1400  D. 1260 E. None of these

 

18.	51	77		175		250	279		?
A.313	B.413	C.512	D.616		E.None of these
19.	2	2	5		15.5	?		267.125
A. 58.25		B. 65.25					C. 56.25			D. 62.25	E. None of these
20.   A.296	219   B.284	223   C. 257			232   D. 273	248   E. 267		?

21.    10      17.5      32.5      55      85      ?

A.121.5   B. 122.5     C. 132.5    D. 137.5    E. None of these

 

22.	1	7	16	30			51		?
A. 81	B.79	C.83	D.85	E. 76
23.	0	6	24	60			120			?
A.240	B.250	C.220	D.224	E. 210
24.    6      6			18	90			630		?
A. 3150			B.5670	C. 6930			D.5420		E.4830
25.	27	35	47			63	83		?
A.105	B.107	C. 114	D. 111		E.None of these
26.	7	12	19		31		50			?
A. 83	B. 79	C. 80	D. 81		E. None of these
27.	2	3	8		27		112		?
A.352	B.565	C.630	D. 435		E. None of these
28.	30	128	346			732			?	2200
A. 1424        B. 1334          C. 1528          D. 1078          E. None of these
29.	16800		4200			1050			262.5			?	16.40625
A. 64.725		B. 60.225						C. 65.625			D. 68.428		E. None of these
30.    156		145      123      90						46			?
A. 3		B. – 1						C. – 7			D. – 9		E. None of these
31.    11		12      39      164						507			?
A. 913		B. 1136						C. 1026			D. 1236		E. None of these
32.    120		145      ?      197						224			257
A. 170		B. 168						C. 165			D. 171		E. None of these

 

 

33.	5	36	191			966		?		24216
A.4641	B. 4841		C.4024		D. 4421			E. None of these
34.	5000		1000		200			40		8		?
A. 2.3	B. 3.2		C. 0.8		D. 1.4			E.None of these
35.	144		153		171			207		279		?
A. 423	B. 411		C. 453		D. 397			E. None of these
36.	76	304      ?				43776				1094400     39398400
A.2736	B. 2959							C. 2498					D. 2659			E. None of these
37.	2	18	36		?	98				146		188
A. 60	B.64	C.68	D. 79		E.None of these
38.	94      99      108      119      130      ?      144
A. 120	B. 125     C. 131      D. 139    E. None of these
39.	15	15		25       58.33						?		641.66	2780.55
A. 175	B.180	C. 190		D. 210     E. None of these
40.	35	65		?	725			3605				21605	151205
A. 170         B. 185                C. 200                D. 215                 E. None of these
41.	131	231		341		461				?	731
A. 631				B. 531					C. 541				D. 591			E. None of these
42.	81	108		124			249		?     628
A. 386				B. 285					C. 341				D. 528			E. None of these
43.	824	568		793			597		766     ?
A. 622				B. 628					C. 714				D. 694			E. None of these
44.	10.5	20		39			67.5		?     153
A. 95.5	B. 101.5							C. 105.5					D. 108.5			E. None of these

 

45.    9     31     73    141     241     ?

1. 319 B. 357 C. 271                          D. 379                          E. None of these

 

46.    161      159      169      227      477      ?

1. 1540 B. 1480 C. 1495           D. 1440         E. None of these

 

47.    33    26.5     ?     64.75     139.5     358.75

36. 36.5 B. 39.5 C. 35.02      D. 37.01       E. None of these

 

48.    31     17      26     64.5      ?      1006.6

218. 218.6 B. 276.7 C. 225.50  D. 224.25     E. None of these

 

49.    16     19      26     39      62     ?

1. 99 B. 103 C. 105   D. 89      E. None of these

 

50.    386     379     358     323     ?     211

1. 274 B. 265 C. 235       D. 280     E. None of these

 

 

 

Correct Answers:

 

1	2	3	4	5	6	7	8	9	10
D	B	B	C	D	C	D	D	A	D
11	12	13	14	15	16	17	18	19	20
C	D	D	B	D	C	A	B	A	D
21	22	23	24	25	26	27	28	29	30
B	A	E	B	B	D	B	B	C	D
31	32	33	34	35	36	37	38	39	40
D	B	B	E	A	A	C	D	A	B
41	42	43	44	45	46	47	48	49	50
D	B	A	C	D	C	A	D	B	A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Explanations:

 

1.

Series Pattern	Given Series
4	4
4 × 6 – 6	18
18 × 5 – 5	85
85 × 4 – 4	336
336 × 3 – 3	1005
1005 × 2 – 2	2008	✓

Hence, option (D) is correct.

 

 

2.

 

Series Pattern	Given Series
9	9
9 + 256	265
265 + 128	393
393 + 64	457
457 + 32	489
489 + 16	505	✓

Hence, option (B) is correct.

 

 

3.

Series Pattern	Given Series
7	7
7 + 2 × 5	17
17 + 3 × 6	35
35 + 4 × 7	63
63 + 5 × 8	103
103 + 6 × 9	157	✓

Hence, option (B) is correct.

 

 

 

 

 

 

4.

Series Pattern	Given Series
40	40
40 × 2 + 2 = 82	82
82 × 3 + 3 = 249	249
249 × 5 + 5 = 1250	1250
1250 × 7 + 7 = 8757	8757	✓

 

Hence, option (C) is correct.

 

 

5.

Series Pattern	Given Series
52 × 1 – 1	24
62 × 2 – 2	70
72 × 3 – 3	144
82 × 4 – 4	252
92 × 5 – 5	400
102 × 6 – 6	594	✓

 

 

 

6.

Series Pattern	Given Series
33	33
33 + 22 + 10	47
33 + 32 + 11	53
33 + 42 + 12	61
33 + 52 + 13	71
33 + 62 + 14	83	✓

Hence, option C is correct.

 

 

7.

Series Pattern	Given Series
660	660
660 – (4 × 12)	656
656 – (4 × 32)	620
620 – (4 × 52)	520
520 – (4 × 72)	324
324 – (4 × 92)	0	✓

Hence, option D is correct.

 

8.

Series Pattern	Given Series
(53 + 8)	133
(63 – 9)	207
(73 + 10)	353
(83 – 11)	501
(93 + 12)	741
(103 – 13)	987	✓

Hence, option D is correct.

 

 

9.

Series Pattern	Given Series
3 × 1.5 + 22 = 8.5	8.5
6 × 2.5 + 32 = 24	24
9 × 3.5 + 42 = 47.5	47.5	✓
12 × 4.5 + 52 = 79	79
15 × 5.5 + 62 = 118.5	118.5
18 × 6.5 + 72 = 166	166

 

 

 

10.

Series Pattern	Given Series
2048	2048
2048 ÷ 4 + 4 = 516	516
516 × 2 = 1032	1032
1032 ÷ 4 + 4 = 262	262
262 × 2 = 524	524	✓
524 ÷ 4 + 4 = 135	135
135 × 2 = 270	270

Hence, there will be 524 in place of question. Hence, option (D) is correct.

 

 

11.

Series Pattern	Given Series
7	7
7 × 1 + 1 × 2	9
9 × 2 – 2 × 3	12
12 × 3 + 3 × 4	48
48 × 4 – 4 × 5	172	✓
172 × 5 + 5 × 6	890

Hence, option C is correct.

 

12.

Series Pattern	Given Series
47	47
47 + (7 + 4)	58
58 + (5 + 8)	71
71 + (7 + 1)	79
79 + (7 + 9)	95
95 + (9 + 5)	109	✓

Hence, option D is correct.

 

 

13.

Series Pattern	Given Series
8	8
8 × 5 – 1 = 39	39
39 × 2 + 1 = 79	79
79 × 5 – 1 = 394	394
394 × 2 + 1 = 789	789
789 × 5 – 1 = 3944	3944	✓

Hence, option (D) is correct.

 

 

14.

Series Pattern	Given Series
15	15
15 + (13 + 1) = 17	17
15 + (23 + 3) = 26	26
15 + (33 + 5) = 47	47
15 + (43 + 7) = 86	86
15 + (53 + 9) = 149	149	✓

Hence, option (B) is correct.

 

 

15.

Series Pattern	Given Series
3	3
3 × 2 + 3	9
9 × 2 + 6	24
24 × 2 + 9	57
57 × 2 + 12	126	✓
126 × 2 + 15	267
267 × 2 + 18	552

Hence, option D is correct.

 

16.

Series Pattern	Given Series
2	2
2 × 1 + 6	8
8 × 2 + 12	28
28 × 3 + 18	102
102 × 4 + 24	432
432 × 5 + 30	2190	✓

Hence, option C is correct.

 

17.

Series Pattern	Given Series
6	6
6 × 3 – 2	16
16 × 3 – 4	44
44 × 3 – 6	126
126 × 3 – 8	370
370 × 3 – 10	1100	✓

Hence, option (A) is correct.

 

 

18.

Series Pattern	Given Series
51	51
51 + (52 + 12) = 77	77
77 + (72 + 72) = 175	175
175 + (12 + 72 + 52) = 250	250
250 + (22 + 52 + 02) = 279	279
279 + (22 + 72 + 92) = 413	413	✓

Hence, option (B) is correct.

 

 

19.

Series Pattern	Given Series
2	2
2 × 0.5 + 1	2
2 × 1.5 + 2	5
5 × 2.5 + 3	15.5
15.5 × 3.5 + 4	58.25	✓
58.25 × 4.5 + 5	267.125

Hence, option (A) is correct.

 

20.

Series Pattern	Given Series
219	219
219 + (12 + 1 + 2) = 223	223
223 + (22 + 2 + 3) = 232	232
232 + (32 + 3 + 4) = 248	248
248 + (42 + 4 + 5) = 273	273	✓

 

Hence, option (D) is correct.

 

Alternate Solution:-

 

Series Pattern	Given Series
219	219
219 + (22 ) = 223	223
223 + (32) = 232	232
232 + (42) = 248	248
248 + (52) = 273	273	✓

 

Hence, option (D) is correct.

 

 

21.

Series Pattern	Given Series
10	10
10 + 15 × 0.5 = 17.5	17.5
17.5 + 15 × 1 = 32.5	32.5
32.5 + 15 × 1.5 = 55	55
55 + 15 × 2 = 85	85
85 + 15 × 2.5 = 122.5	122.5	✓

 

Hence, option (B) is correct.

 

 

22.

Series Pattern	Given Series
1	1
1 + (1 × 1 + 5 ) = 7	7
7 + (2 × 2 + 5 ) = 16	16
16 + (3 × 3 + 5 ) = 30	30
30 + (4 × 4 + 5 ) = 51	51
51 + (5 × 5 + 5 ) = 81	81	✓

Hence, option (A) is correct.

 

23.

Series Pattern	Given Series
13 – 1 = 0	0
23 – 2 = 6	6
33 – 3 = 24	24
43 – 4 = 60	60
53 – 5 = 120	120
63 – 6 = 210	210	✓

Hence, option (E) is correct.

 

24.

Series Pattern	Given Series
6	6
6 × 1 = 6	6
6 × 3 = 18	18
18 × 5 = 90	90
90 × 7 = 630	630
630 × 9 = 5670	5670	✓

Hence, option (B) is correct.

 

25.

Series Pattern	Given Series
27	27
27 + 8 = 35	35
35 + 12 = 47	47
47 + 16 = 63	63
63 + 20 = 83	83
83 + 24 = 107	107	✓

Hence, option (B) is correct.

 

26.

Series Pattern	Given Series
7	7
7 + 5 = 12	12
12 + 7 = 19	19
19 + 12 = 31	31
31 + 19 = 50	50
50 + 31 = 81	81	✓

Hence, option (D) is correct.

 

27.

Series Pattern	Given Series
2	2
2 × 1 + 1 = 3	3
3 × 2 + 2 = 8	8
8 × 3 + 3 = 27	27
27 × 4 + 4 = 112	112
112 × 5 + 5 = 565	565	✓

Hence, option (B) is correct.

 

 

28.

Series Pattern	Given Series
33 + 3 = 30	30
55 + 3 = 128	128
73 + 3 = 346	346
93 + 3 = 732	732
113 + 3 = 1334	1334	✓
133 + 3 = 2200	2200

Hence, option (B) is correct.

 

 

29.

Series Pattern	Given Series
16800	16800
16800 ÷ 4 = 4200	4200
4200 ÷ 4 = 1050	1050
1050 ÷ 4 = 262.5	262.5
262.5 ÷ 4 = 65.625	65.625	✓
65.625 ÷ 4 = 16.40625	16.40625

Hence, option (C) is correct.

 

 

30.

Series Pattern	Given Series
156	156
156 – 11 = 145	145
145 – 22 = 123	123
123 – 33 = 90	90
90 – 44 = 46	46
46 – 55 = – 9	– 9	✓

 

Hence, option (D) is correct.

 

31.

Series Pattern	Given Series
11	11
11 + 13 = 12	12
12 + 33 = 39	39
39 + 53 = 164	164
164 + 73 = 507	507
507 + 93 = 1236	1236	✓

Hence, option (D) is correct.

 

 

32.

Series Pattern	Given Series
(112 – 1) = 120	120
(122 + 1) = 145	145
(132 – 1) = 168	168	✓
(142 + 1) = 197	197
(152 – 1) = 224	224
(162 + 1) = 257	257

Hence, option (B) is correct.

 

 

33.

Series Pattern	Given Series
5	5
5 × 5 + 11 = 36	36
36 × 5 + 11 = 191	191
191 × 5 + 11 = 966	966
966 × 5 + 11 = 4841	4841	✓
4841 × 5 + 11 = 24216	24216

Hence, option (B) is correct

 

 

34.

Series Pattern	Given Series
5000	5000
5000 ÷ 5 = 1000	1000
1000 ÷ 5 = 200	200
200 ÷ 5 = 40	40
40 ÷ 5 = 8	8
8 ÷ 5 = 1.6	1.6	✓

Hence, option (E) is correct.

 

35.

Series Pattern	Given Series
144	144
144 + 9 = 153	153
153 + 18 = 171	171
171 + 36 = 207	207
207 + 72 = 279	279
279 + 144 = 423	423	✓

 

Hence, option (A) is correct.

 

36.

Series Pattern	Given Series
76	76
76 × (2)2	304
304 × (3)2	2736	✓
2736 × (4)2	43776
43776 × (5)2	1094400
1094400 × (6)2	39398400

 

Hence, option A is correct.

 

37.

Series Pattern	Given Series
2 + 2(7 + 1)	18
18 + 3(7 – 1)	36
36 + 4(7 + 1)	68	✓
68 + 5(7 – 1)	98
98 + 6(7 + 1)	146
146 + 7(7 – 1)	188

 

Hence, option C is correct.

 

 

38.

Series Pattern	Given Series
94 – (2)2 + 9	99
9 – (3)2 + 18	108
108 – (4)2 + 27	119
119 – (5)2 + 36	130
130 – (6)2 + 45	139	✓
139 – (7)2 + 54	144

 

Hence, option D is correct.

 

39.

Series Pattern	Given Series
15 × 3 ÷ 3	15
15 × 5 ÷ 3	25
25 × 7 ÷ 3	58.33
58.33 × 9 ÷ 3	175	✓
175 × 11 ÷ 3	641.66
641.66 × 13 ÷ 3	2780.55

 

Hence, option A is correct

 

 

40.

Series Pattern	Given Series
35 × 2 – 5	65
65 × 3 – 10	185	✓
185 × 4 – 15	725
725 × 5 – 20	3605
3605 × 6 – 25	21605
21605 × 7 – 30	151205

 

Hence, option B is correct.

 

 

41.

Series Pattern	Series
43 × 3 + (1 × 2)	131
45 × 5 + (2 × 3)	231
47 × 7 + (3 × 4)	341
49 × 9 + (4 × 5)	461
51 × 11 + (5 × 6)	591	✓
53 × 13 + (6 × 7)	731

 

Hence, option D is correct.

 

 

42.

Series Pattern	Series
81	81
81 + 33	108
108 + 42	124
124 + 53	249
249 + 62	285	✓
285 + 73	628

 

Hence, option B is correct.

 

43.

Series Pattern	Series
824	824
824 – 162	568
568 + 152	793
793 – 142	597
597 + 132	766
766 – 122	622	✓

Hence, option A is correct.

 

 

44.

Series Pattern	Series
10.5	10.5
10.5 + (9 × 1) + (0.5)	20
20 + (9 × 2) + 1	39
39 + (9 × 3) + (1.5)	67.5
67.5 + (9 × 4) + (2)	105.5	✓
105.5 + (9 × 5) + (2.5)	153

Hence, option C is correct.

 

45.

Series Pattern	Series
12 + 23	9
22 + 33	31
32 + 43	73
42 + 53	141
52 + 63	241
62 + 73	379	✓

Hence, option D is correct.

 

46. Given Series:

Series I 161 159 169 227 477 ? Series II (+3–5) (+15–5) (+63–5) (+255–5) ? Series III (3×4)+3 → (15×4)+3 → (63×4)+3 → ?

:

:

:

Series Pattern:

Series I 161 159 169 227 477 1495 Series II (+3–5) (+15–5) (+63–5) (+255–5) (1023–5) Series III (3×4)+3 (15×4)+3 (63×4)+3 (255×4)+3

:

:

:

Hence, there must be 1495 in place of question mark. Therefore option (C) is correct.

 

47.

Series Pattern	Given Series
33	33
33 × 0.5 +10 = 26.5	26.5
26.5 × 1.0 + 10 = 36.5	36.5	?
36.5 × 1.5 + 10 = 64.75	64.75
64.75 × 2.0 + 10 = 139.5	139.5
139.5 × 2.5 + 10 = 358.75	358.75

 

Hence, option (A) is correct.

 

 

48.

Series Pattern	Given Series
31	31
(31 × 0.5 – 0.5)+2 = 17	17
(17 × 1.5 – 1.5) + 2 = 26	26
(26 × 2.5 – 2.5) + 2 = 64.5	64.5
(64.5 × 3.5 – 3.5) + 2 = 224.25	224.25	?
(224.25 × 4.5 – 4.5) + 2 = 1006.625	1006.625

 

Hence, option (D) is correct.

 

 

49.

Series Pattern	Given Series
16	16
16 + 21 + 1 = 19	19
19 + 22 + 3 = 26	26
26 + 23 + 5 = 39	39
39 + 24 + 7 = 62	62
62 + 25 + 9 = 103	103	✓

 

Hence, option (B) is correct.

 

 

50.

Series Pattern	Given Series
386	386
386 – 7 (= 1 × 7) = 379	379
379 – 21 (= 3 × 7) = 358	358
358 – 35 (= 5 × 7) = 323	323
323 – 49 (= 7 × 7) = 274	274	✓
274 – 63 (= 9 × 7) = 211	211

Hence, option A is correct.