This document contains 16 letter and number series problems along with their solutions. The problems are from various bank and SSC exams and test the ability to determine the logical pattern or relationship between elements in a series and identify the next element. The document provides the full series and answer for each problem to help in understanding letter and number series logic.

1. BANK EXAMS AND SSC
Series
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2. Problems
What should come next in the following letter series. (CBI PO, 2010)
1. B C E H L ?
1. P
2. Q
3. O
4. Cannot be determined
5. None of these
Answer : 2
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3. Problems
What should come next in the following letter series. (IBPS RRB Scale 1, 2014)
2. AN CQ ET GW ?
1. JZ
2. IZ
3. IY
4. KA
5. LZ
Answer : 2
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4. Problems
What should come next in the following letter series. (SBI PO)
3. AG IN PT ?
1. VZ
2. WZ
3. VY
4. UX
5. UZ
Answer : 3
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5. Problems
What should come next in the following letter series. (Corporation Bank PO)
4. G F E D C B A F E D C B A E D C B A D C ?
1. C
2. D
3. B
4. A
5. E
Answer : 3
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6. Problems
What should come next in the following letter series. (Indian Overseas Bank PO, 2009)
5. A Z A B Y A B C X A B C D W A B C D E ?
1. U
2. T
3. A
4. G
5. V
Answer : V
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7. Problems
What should come next in the following letter series. (SBI Associates PO, 2008)
6. B B C B C D B C D E B C D E F B C D E F G B C D E F
1. A
2. E
3. H
4. G
5. C
Answer : G
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8. Problems
The following questions are based on the alphabetical series given below.
M J L I T Q S R K U F H C B D E A V P O G N (RBI, 2012)
7. N, PO, BDE, ?
1. UKR
2. SRKU
3. RKUF
4. QSRK
5. FUK
Answer : 2
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9. Problems
The following questions are based on the alphabetical series given below.
M J L I T Q S R K U F H C B D E A V P O G N (RBI, 2012)
8. If in a certain code, 'BIND' is coded as 'CLGB' and 'HELD' is coded as 'FDJB' based on
the series given above. How will 'FORK' be coded in the same code language?
1. UKR
2. SRKU
3. RKUF
4. QSRK
5. UPSR
Answer : 5
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10. Problems
The following questions are based on the alphabetical series given below.
M J L I T Q S R K U F H C B D E A V P O G N (RBI, 2012)
9. 'HC' is related to 'KQ' in a certain way. Similarly, 'OG' is related to 'AB' in the same
way. To which of the following is 'RK' related following the same pattern?
1. TJ
2. SI
3. TI
4. HD
5. IM
Answer : 4 (-3 and -7)
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11. Problems
10. What should come next in the following letter series?
CEA IKG OQM
A. STW
B. WUS
C. SWU
D. UWS
E. None of these
Answer : D (O+6, Q+6, M+6)
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12. Problems
The following questions are based on the alphabetical series given below.
C L R T B Q S M A P D I N F J K G Y X
11. Four of the following five are alike in a certain way and so form a group.
Which is the one that does not belong to the group?
1. LBT
2. SPA
3. IJF
4. PID
5. BMS
Answer : D (+3 and -1)
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13. Problems
The following questions are based on the alphabetical series given below.
C L R T B Q S M A P D I N F J K G Y X
12. If ‘CT’ is related to ‘RQ’ and ‘AI’ is related to ‘DF’ in a certain way , to which of
the following is ‘SP’ related to, following the same pattern?
1. MD
2. DN
3. AD
4. AI
5. DF
Answer : 4 (+2 and -2)
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14. Problems
The following questions are based on the alphabetical series given below.
C L R T B Q S M A P D I N F J K G Y X
13.CR LB TM SI ?
1. PK
2. DK
3. NX
4. PG
5. DG
Answer : 5 (+1, +2, +3, +4)
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15. Problems
Fill the gaps in the following letter series.
14. gfe_ig_eii_fei_gf_ii
1. eifgi
2. figie
3. ifgie
4. ifige
Answer : 3 (gfeii)
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16. Problems
Fill the gaps in the following letter series.
15. aa_a_b_abaa_
1. abab
2. baba
3. baab
4. abba
Answer : 3 (aab)
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17. Problems
Fill the gaps in the following letter series.
16. b_ccabb_cabbc_ab_cca
1. bcbc
2. bbbc
3. bccb
4. bbcc
Answer : 3 (bbcca)
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18. Problems
Fill the gaps in the following letter series.
17. _ _StUrrS_Urr_tUrrS_U
1. rStUU
2. rrStS
3. rrStU
4. SSttU
Answer : 3 (rrStU)
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19. Problems
Fill the gaps in the following letter series.
18. rtx_sx_z_txy_ _yz
1. yyrxs
2. yxsxr
3. yyrsx
4. yxyrs
Answer : 3 (rtxysxyz)
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20. Problems
What should come next in the following number series. (SBI Clerk, 2012)
1. 0 9 0 1 9 0 1 2 9 0 1 2 3 9 0 1 2 3 4 9 ?
1. 1
2. 0
3. 2
4. 9
5. 5
Answer : 2
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21. Problems
In the following sequence or instructions, 1 stands for Run, 2 stands for Stop, 3
stands for Go, 4 stands for Sit and 5 stands for Wait. If the sequence is
continued, which instruction will come next? (SBI Clerk 2014)
2. 44 54 53 45 31 45 31 24 45 45 34 53
(a) Wait
(b) Sit
(c) Stop
(d) Run
(e) None of these
Answer : Run(4, 45, 453, 4531, 45312)
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22. Problems
What should come next in the following number series. (SSC CGL, 1999)
3. 18, 24, 21, 27, ?, 30, 27
1. 33
2. 30
3. 27
4. 24
5. 21
Answer : 4 (+6, -3)
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23. Problems
What should come next in the following number series. (SSC CGL, 2004)
4. 100, 52, 28, 16, 10, ?
1. 5
2. 7
3. 2
4. 9
5. 8
Answer : 2 (Divide by 2 & then add by 2)
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24. Problems
What should come next in the following number series. (SSC CGL, 1999)
5. 5760, 960, ?, 48, 16, 8
1. 240
2. 192
3. 96
4. 120
5. 160
Answer : 2 (*2, *3, *4, *5, *6)
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25. Problems
What should come next in the following number series. (SSC CGL, 1999)
6. 15, 31, 64, 131, ?
1. 266
2. 256
3. 96
4. 192
5. 524
Answer : 2 (*2+1, *2+2, *2+3, *2+4)
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26. Problems
What should come next in the following number series. (SSC CGL, 1999)
7. 2, 3, 10, 29, 66, ?
1. 89
2. 99
3. 96
4. 127
5. 130
Answer : 4 (Third order difference is constant and it is 6)
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27. Problems
What should come next in the following number series. (SSC CPO SI, 2007)
8. 1, 1, 2, 4, 3, 9, 4, 16, 5, ?, ?
1. 6, 22
2. 21, 9
3. 5, 25
4. 25, 6
5. 18, 8
Answer : 4 (Number, it’s square)
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28. Problems
What should come next in the following number series. (SSC CPO SI, 2007)
9. 4117, 5138, 6159, 7170, ?
1. 7138
2. 7659
3. 8191
4. 8179
Answer : 19 (4 11 7, 5 13 8, 6 15 9, 7 17 0)
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29. Problems
What should come next in the following series. (SSC CGL, 1999)
10. 4/12/95, 1/1/96, 29/1/96, 26/2/96, ?
1. 24/3/96
2. 25/3/96
3. 26/3/96
4. 27/3/96
5. 23/3/96
Answer : 2 (28 days difference)
1996 is a leap year. It had 29 days in Feb.
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30. Problems
What should come next in the following series. (LIC AAO, 2009)
11. H 4 W, I 18 V, K 48 T, N 100 Q, ? , W 294 H
1. P 1485 S
2. R 180 M
3. S 198 I
4. T 206 K
Answer : 2 (H+1+2+3+4+5 = W, third order difference const, W-1-2-3-4-5=
H )
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31. Problems
What should come next in the following series. (SSC CPO SI, 2003)
12. 2, 5, 9, 19, 37, ?
1. 73
2. 75
3. 76
4. 78
Answer : 2 (*2+1, *2-1)
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32. Problems
What should come next in the following series. (SSC CGL, 2002)
13. 3, 7, 23, 95, ?
1. 575
2. 479
3. 128
4. 192
Answer : 2 (*2+1, *3+2, *4+3, *5+4)
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33. Problems
14. If 5-7=5; 12-3=6; 8-9=2. Find 6-8. (SSC LDC, 2012)
1. 5
2. 8
3. 6
4. 2
Answer : 2 (Unit’s digit of 35, 36, 72. 6*8=48, So 8.)
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34. Problems
What should come next in the following series.
15. 4, 5, 8, 14, 24, 39, 60, ?
1. 98
2. 79
3. 88
4. 92
Answer : 3 (Difference is Triangular numbers, i.e.,1, 3, 6, 10…. So
60+28=88)
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35. Problems
What should come next in the following series.
16. 2, 10, 37, 101, 226, ?
1. 442
2. 342
3. 292
4. 392
Answer : 1 (2, 2 + 23, 10 + 33, 37 + 43, 101 + 53, 226 + 63. So
226+216=442)
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