SSC & BANK EXAMS: REASONING · SERIES

Letter series

Convert letters to positions (A=1 … Z=26) and look for the gap pattern: fixed, increasing, or two letters moving in opposite directions.

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Worked examples

Example 1 · level 1

Find the missing term: A, B, C, D, E, ?

H
E
F
G

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Positions: 1, 2, 3, 4, 5, ?.
Gaps: +1, +1, +1, +1, +1.
Missing letter = position 6 = F.

Answer: F

Example 2 · level 2

Find the missing term: A, B, D, G, ?, P

L
J
K
M

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Positions: 1, 2, 4, 7, ?, 16.
Gaps: +1, +2, +3, +4, +5.
Missing letter = position 11 = K.

Answer: K

Example 3 · level 3

Find the next term: DV, GU, JT, MS, PR, ?

SR
QS
SQ
TQ

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First letters: D, G, J, M, P → +3 each → S.
Second letters: V, U, T, S, R → −1 each → Q.
Next term = SQ.

Answer: SQ