1. Series

Introduction:-
A series of single, pairs or group of letters or combinations of letter and numerals is given. The given series of letters can be in natural or in reverse order. While attempting questions on letter series one should note the pattern of alphabet series. The terms of the series form a certain patterns. The candidate is required to decipher this pattern and find the missing term or the wrong term in the given series.

EXERCISE

1. A, C, F, J, ?
   (a) K
   (b) O
   (c) M
   (d) N
   (e) None
   
2. A, Z, D, Y, G, X, ?,?
   (a) W, J
   (b) J, W
   (c) W, K
   (d) K, W
   (e) None
   
3. A, D, E, H, I, L, ?, ?
   (a) M,P
   (b) M,N
   (c) M,O
   (d) M,Q
   (e) None
   
4. M N, O L, R I, V?
   (a) A
   (b) E
   (c) F
   (d) H
   (e) Z
   
5. W, T, P, M, I, F, B, ?, ?
   (a) Z,V
   (b) X,U
   (c) Y,U
   (d) Y,V
   (e) None
   
6. A, P, C, Q, E, R, G, ?, ?
   (a) S, I
   (b) H, I
   (c) I, S
   (d) T, J
   (e) None
   
7. DF, GI, KM, NQ, RT,?
   (a) UW
   (b) YZ
   (c) XZ
   (d) UX
   (e) None
   
8. DKY, FJW, HIU, JHS, ?
   (a) LFQ
   (b) LGQ
   (c) KGR
   (d) KFR
   (e) None
   
9. YVP, WTN, URL,?
   (a) VSP
   (b) SRJ
   (c) SPJ
   (d) TQL
   (e) None
   
10. Find the missing term in the following series: ZBD, BDF, ….., FHJ, HJL
    (a) DEH
    (b) DFH
    (c) EFG
    (d) EFH
    (e) None of these
    
11. AC, FH, KM, PR,?
    (a) UW
    (b) VW
    (c) UX
    (d) TV
    (e) None of these
    
12. FLU, GMV, HNW, IOX, ?
    (a) JYP
    (b) WYP
    (c) WPY
    (d) JPY
    (e) None of these
    
13. AB, DEF, HIJK, ?, STUVWX
    a) LMNO
    b) LMNOP
    c) MNOPQ
    d) QRSTU
    e) NOPQR
    
14. PERPENDICULAR, ERPENDICULA, RPENDICUL,?
    a) PENDICUL
    b) PENDIC
    c) ENDIC
    d) ENDICU
    e) None of these
    
15. ADVENTURE, DVENTURE, DVENTUR, ?, VENTU
    a) DVENT
    b) VENTURE
    c) VENTUR
    d) DVENTU
    e) None of these
    
16. A, B, B, D, C, F, D, H, E, ?, ?
    a) E, F
    b) F,G
    c) F, I
    d) J, F e) J, K
    
17. AZB,CYD,EXF,?,IVJ,KUL
    (a) FYH
    (b) GWG
    (c) HWH
    (d) GUF
    (e) None
    
18. A, D, H, M, ?, Z
    (a)T
    (b) G
    (c) N
    (d) S
    
19. b e d f ? h j ? 1
    (a) i m
    (b) m I
    (c) i n
    (d) j m
    
20. E, J, ?, T, Y, D
    (a) B
    (b) O
    (c) F
    (d) J
    (e) None of these
    
21. BZA, DYC, FXE,____,JVI
    (a) HUG
    (b) HWG
    (c) UHG
    (d) WHG
    (e) None
    
22. AN, BO, CP, DQ, ___
    (a) ER
    (b) FG
    (c) EJ
    (d) FR
    (e) None
    
23. 1 ED, 2 FD, 3 KH, ? , 15 KG,48 KF
    (a) 12 PX
    (b) 6 RI
    (c) 9 LV
    (d) 8 TQ
    (e) None
    
24. R5P, T6M, V9 J, X 15 G, ?
    (a) A 12 L
    (b) I 18 X
    (c) Z 25 D
    (d) U 20 Q
    (e) None
    
25. H 4 W, I 18 V, K 48 T, N 100 Q, ?, W 294 H
    (a) P 1485 S
    (b) R 180 M
    (c) S 198 I
    (d) T 206 K
    (e) None
    
26. F2, ___, D8, C16, B32
    (a) A16
    (b) G4
    (c) E4
    (d) E3
    (e) None
    
27. J14, L16,___, P20, R22
    (a) S24
    (b) N18
    (c) M18
    (d) T24
    (e) None
    
28. U32, V29, ___, X23, Y20
    (a) W26
    (b) W17
    (c) Z17
    (d) Z26
    (e) None
    
29. B2CD,____,BCD4, B5CD, BC6D
    (a) B2C2D
    (b) BC3D
    (c) B2C3D
    (d) BCD7
    (e) None
    
30. DEF, DEF2, DE2F2,____,D2E2F3
    (a) DEF3
    (b) D3EF3
    (c) D2E3F
    (d) D2E2F2
    (e) None
    
31. ZA5, Y4B, XC6, W3D,____
    (a) E7V
    (b) V2E
    (c) VE5
    (d) VE7
    (e) None
    
32. P5QR, P4QS, P3QT, ____, P1QV
    (a) PQW
    (b) PQV2
    (c) P2QU
    (d) PQ3U
    (e) None
    
33. SCD, TEF, UGH, ___, WKL
    (a) CMN
    (b) UJI
    (c) VIJ
    (d) IJT
    (e) None
    
34. ELFA, GLHA, ILJA, ____, MLNA
    (a) OLPA
    (b) KLMA
    (c) LLMA
    (d) KLLA
    (e) None
    
35. DF, GJ, KM, PR, ?
    (a) UX
    (b) TV
    (c) UW
    (d) VW
    
36. 5G7 7H10 10 I14 14J19........
    (a) 16K20
    (b) 17K21
    (c) 18K21
    (d) 19K25
    (e) None of these
    
37. J15K M21N…….. S39T V51W
    (a) N24P
    (b) P27Q
    (c) P29Q
    (d) P25Q
    (e) None of these
    
38. D23F H19J L17N …… T11V
    (a) P15R
    (b) P14R
    (c) P13R
    (d) P12R
    (e) None of these
    
39. A70B D65F H60J ...... P50R
    (a) K55L
    (b) L55M
    (c) L55N
    (d) L55P
    (e) None of these
    
40. 4A, 12D, 28G, 60J, 124M, *?’
    (a) 248Q
    (b) 252P
    (c) 256T
    (d) 246S
    (e) None of these
    
41. What are the missing letters in the following series? pqr_ _r s prs _ _ spq _
    a) pqppq
    b) spqpr
    c) sqpqr d) sqprq
    (e) None
    
42. Find the missing letters in the following series: uv – u – ww – xu – vv-
    a) vwxuu
    b) vuvuv
    c) uvxuv
    d) vuxuu
    (e) None
    
43. a b - - - - - d - a - - - - -
    a) dabce
    b) eabcd
    c) edcba
    d) cdebc
    
44. In the following letter sequence, some letters have been left out which are given as one of the four alternatives given under in that order. Find the alternative:
    m _ nm _ n _ an _ a _ ma _
    a) aamnan
    b) ammanm
    c) aammnn
    d) amammn
    e) None of these
    
45. Which one set of letters when sequentially placed at the gaps in the given letter series shall completer it? cc_ccbc_accbcc_c_b
    a) a c a c
    b) a b a c
    c) a b a b
    d) a a b c
    e) None of these
    
    Directions (46-50): In each of the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
46. f - h i g h - j h i j - i j - 1 - k l m
    (a) gikkj
    (b) jijlk
    (c) fihjk
    (d) ihjfk
    
47. m - o - o m o - n - n o n o –
    (a) nomon
    (b) mnmon
    (c) nnmmm
    (d) monno
    
48. q - r - s s s q r - r r - s - q
    (a) rssqr
    (b) srqsq
    (c) rqqrs
    (d) qsrsq
    
49. - j i x h - i j h y y - i x - x - j hy
    (a) jihxy
    (b) yxjhi
    (c) hiyxj
    (d) xjihy
    
50. ab- - baa- - ab -
    (a) baabb
    (b) aabab
    (c) aabaa
    (d) aaaaa

Answer key

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