Practice Letter and Symbol Series questions covering alphabet and symbol sequences, missing letter/symbol patterns, and mixed letter-number-symbol series for Logical Reasoning.
Question 1
Fill the blank in the series.

AEE, CGG, EII, _____, IMM
A
GJJ✓✗
B
HKK✓✗
C
GLL✓✗
D
GKK✓✗
Explanation
The first letters are in alphabetical order with a letter skipped in between each segment: A, C, E, G, I. The second and third letters are repeated; they are also in order with a skipped letter: E, G, I, K, M.
Question 2
Fill the blank in the series.

BHH, DJJ, FLL, _____, JPP
A
HMM✓✗
B
INN✓✗
C
HNN✓✗
D
HOO✓✗
Explanation
The first letters are in alphabetical order with a letter skipped in between each segment: B, D, F, H, J. The second and third letters are repeated; they are also in order with a skipped letter: H, J, L, N, P.
Question 3
Fill the blank in the series.

PDQT, RDST, TDUT, _____, XDYT
A
VDVT✓✗
B
WDXT✓✗
C
UDWT✓✗
D
VDWT✓✗
Explanation
The second and fourth letters in the series, D and T, are static. The first and third letters consist of an alphabetical order beginning with the letter P, moving 2 letters each time: PQ, RS, TU, VW, XY.
Question 4
Fill the blank in the series.

BMCZ, DMEZ, FMGZ, _____, JMKZ
A
HMJZ✓✗
B
IMHZ✓✗
C
HMIZ✓✗
D
GMIZ✓✗
Explanation
The second and fourth letters in the series, M and Z, are static. The first and third letters consist of an alphabetical order beginning with the letter B, moving 2 letters each time: BC, DE, FG, HI, JK.
Question 5
Fill the blank in the series.

RCS, SCR, TCU, UCT, _____
A
VCU✓✗
B
VCW✓✗
C
WCV✓✗
D
UCV✓✗
Explanation
The middle letters are static, so concentrate on the first and third letters. The series involves an alphabetical order with a reversal of the letters. The first letters are in alphabetical order: R, S, T, U, V. The second and fourth segments are reversals of the first and third segments. The missing segment begins with a new letter.
Question 6
Fill the blank in the series.

KBL, LBK, MBN, NBM, _____
A
OBN✓✗
B
PBO✓✗
C
NBO✓✗
D
OBP✓✗
Explanation
The middle letters are static, so concentrate on the first and third letters. The series involves an alphabetical order with a reversal of the letters. The first letters are in alphabetical order: K, L, M, N, O. The second and fourth segments are reversals of the first and third segments. The missing segment begins with a new letter.
Question 7
Fill the blank in the series.

KAB, LCD, MEF, _____, OIJ
A
NGH✓✗
B
NHG✓✗
C
MGH✓✗
D
OGH✓✗
Explanation
There are two alphabetical series here. The first series is with the first letters only: KLMNO. The second series involves the remaining letters: AB, CD, EF, GH, IJ.
Question 8
Fill the blank in the series.

BIJ, CKL, DMN, _____, FQR
A
EPO✓✗
B
FOP✓✗
C
EOP✓✗
D
DOP✓✗
Explanation
There are two alphabetical series here. The first series is with the first letters only: BCDEF. The second series involves the remaining letters: IJ, KL, MN, OP, QR.
Question 9
Fill the blank in the series.

DZE, EZF, FZG, GZH, _____
A
HZG✓✗
B
GZI✓✗
C
IZH✓✗
D
HZI✓✗
Explanation
In this series, the third letter is repeated as the first letter of the next segment. The middle letter, Z, remains static. The third letters are in alphabetical order, beginning with E.
Question 10
Fill the blank in the series.

MBN, NBO, OBP, PBQ, _____
A
QBP✓✗
B
QBR✓✗
C
PBR✓✗
D
RBQ✓✗
Explanation
In this series, the third letter is repeated as the first letter of the next segment. The middle letter, B, remains static. The third letters are in alphabetical order, beginning with N.
Question 11
Fill the blank in the series.

MNM, OPO, QRQ, STS, _____
A
UWU✓✗
B
VWV✓✗
C
UVU✓✗
D
UVV✓✗
Explanation
This series consists of a simple alphabetical order with the first two letters of all segments: M, N, O, P, Q, R, S, T, U, V. The third letter of each segment is a repetition of the first letter.
Question 12
Fill the blank in the series.

CDC, EFE, GHG, IJI, _____
A
KLK✓✗
B
KJK✓✗
C
LML✓✗
D
KLM✓✗
Explanation
This series consists of a simple alphabetical order with the first two letters of all segments: C, D, E, F, G, H, I, J, K, L. The third letter of each segment is a repetition of the first letter.
Question 13
Fill the blank in the series.

PMQ, QNR, ROS, SPT, _____
A
TPU✓✗
B
TQU✓✗
C
SQT✓✗
D
UQV✓✗
Explanation
This is an alternating series in alphabetical order. The middle letters follow the order MNOPQ. The first and third letters are alphabetical beginning with P and Q. The third letter is repeated as the first letter in each subsequent three-letter segment.
Question 14
Fill the blank in the series.

DAE, EBF, FCG, GDH, _____
A
HFI✓✗
B
GEH✓✗
C
IEJ✓✗
D
HEI✓✗
Explanation
This is an alternating series in alphabetical order. The middle letters follow the order ABCDE. The first and third letters are alphabetical beginning with D and E. The third letter is repeated as the first letter in each subsequent three-letter segment.
Question 15
Fill the blank in the series.

XWV, UTS, RQP, _____, LKJ
A
ONM✓✗
B
MNO✓✗
C
PON✓✗
D
LKJ✓✗
Explanation
This series consists of letters in reverse alphabetical order: XWV, UTS, RQP, ONM, LKJ.
Question 16
Fill the blank in the series.

TSR, QPO, NML, _____, HGF
A
KIJ✓✗
B
HGF✓✗
C
KJI✓✗
D
JKL✓✗
Explanation
This series consists of letters in reverse alphabetical order: TSR, QPO, NML, KJI, HGF.
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