Letter and Symbol Series — 18 Aptitude Questions and Answers with Explanations

Letter and Symbol Series — Questions and Answers

Letter series replace numbers with alphabet positions, so the whole topic collapses into arithmetic once you can convert letters to numbers instantly. Learn A = 1 through Z = 26 and the reverse mapping (A ↔ Z, B ↔ Y, C ↔ X — the "opposite letter" rule), and letter series become as mechanical as number series.

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Letter and Symbol Series— Concepts, Formulas & Shortcuts

Memorise positions using EJOTY: E = 5, J = 10, O = 15, T = 20, Y = 25.
Opposite-letter rule: the pair positions always sum to 27 (A↔Z, B↔Y, C↔X, M↔N).
Convert every letter to its position, find the difference pattern, then convert back.
For grouped series (AZ, BY, CX…), analyse each position in the group separately.
Reverse series simply have negative differences — treat them identically.
Skip patterns often grow: +2, +3, +4, +5 is one of the most common exam sequences.

Letter and Symbol Series Practice Questions with Answers

Attempt each question first, then open the explanation. All 18 questions below are free to read and require no signup.

Q1.Complete the series: Z, X, V, T, ?
Easy
- AR
- BS
- CQ
- DP
+Show Answer & Explanation
Answer: A. R
Explanation: Positions 26, 24, 22, 20 decrease by 2 → next is 18 = R.
Letter and Symbol Series question 1 of 18
Q2.Complete the series: A, C, F, J, ?
Moderate
- AM
- BN
- CO
- DP
+Show Answer & Explanation
Answer: C. O
Explanation: Positions 1, 3, 6, 10 with gaps +2, +3, +4 → next gap +5 gives 15 = O.
Letter and Symbol Series question 2 of 18
Q3.Complete the series: B, D, G, K, ?
Moderate
- AN
- BO
- CP
- DQ
+Show Answer & Explanation
Answer: C. P
Explanation: Positions 2, 4, 7, 11 with gaps +2, +3, +4 → next is 11 + 5 = 16 = P.
Letter and Symbol Series question 3 of 18
Q4.Complete the series: AZ, BY, CX, ?
Easy
- ADV
- BDW
- CEW
- DDX
+Show Answer & Explanation
Answer: B. DW
Explanation: The first letter moves forward (A, B, C, D) and the second backward (Z, Y, X, W) → DW.
Letter and Symbol Series question 4 of 18
Q5.Complete the series: ACE, BDF, CEG, ?
Moderate
- ADFH
- BDEG
- CEGI
- DDGI
+Show Answer & Explanation
Answer: A. DFH
Explanation: Every letter in each group advances by one from the previous group → DFH.
Letter and Symbol Series question 5 of 18
Q6.Complete the series: Z, W, T, Q, ?
Moderate
- AM
- BN
- CO
- DP
+Show Answer & Explanation
Answer: B. N
Explanation: Positions 26, 23, 20, 17 decrease by 3 → next is 14 = N.
Letter and Symbol Series question 6 of 18
Q7.Which letter is opposite to D in the alphabet?
Easy
- AV
- BW
- CX
- DY
+Show Answer & Explanation
Answer: B. W
Explanation: Opposite position = 27 − 4 = 23, which is W.
Letter and Symbol Series question 7 of 18
Q8.Complete the series: AB, DE, GH, ?
Moderate
- AIJ
- BJK
- CKL
- DHI
+Show Answer & Explanation
Answer: B. JK
Explanation: Each group skips one letter after it: AB (skip C), DE (skip F), GH (skip I) → JK.
Letter and Symbol Series question 8 of 18
Q9.Complete the series: C, F, I, L, ?
Easy
- AN
- BO
- CP
- DQ
+Show Answer & Explanation
Answer: B. O
Explanation: Positions 3, 6, 9, 12 increase by 3 → next is 15 = O.
Letter and Symbol Series question 9 of 18
Q10.Complete the series: A, B, D, G, ?
Moderate
- AI
- BJ
- CK
- DL
+Show Answer & Explanation
Answer: C. K
Explanation: Positions 1, 2, 4, 7 with gaps +1, +2, +3 → next gap +4 gives 11 = K.
Letter and Symbol Series question 10 of 18
Q11.Complete the series: Y, V, S, P, ?
Moderate
- AL
- BM
- CN
- DO
+Show Answer & Explanation
Answer: B. M
Explanation: Positions 25, 22, 19, 16 decrease by 3 → next is 13 = M.
Letter and Symbol Series question 11 of 18
Q12.Complete the series: AB, CD, EF, ?
Easy
- AGH
- BHI
- CFG
- DGI
+Show Answer & Explanation
Answer: A. GH
Explanation: Consecutive letter pairs continue in order → GH.
Letter and Symbol Series question 12 of 18
Q13.Complete the series: BA, DC, FE, ?
Moderate
- AGH
- BHG
- CIJ
- DJI
+Show Answer & Explanation
Answer: B. HG
Explanation: Each pair takes the next two letters written in reverse: G and H become HG.
Letter and Symbol Series question 13 of 18
Q14.Complete the series: AZ, BY, CX, DW, ?
Moderate
- AEU
- BEV
- CFV
- DFU
+Show Answer & Explanation
Answer: B. EV
Explanation: First letters advance A, B, C, D, E; second letters retreat Z, Y, X, W, V → EV.
Letter and Symbol Series question 14 of 18
Q15.Which letter is the 8th from the right end of the English alphabet?
Moderate
- AR
- BS
- CT
- DU
+Show Answer & Explanation
Answer: B. S
Explanation: Position from the left = 27 − 8 = 19, which is S.
Letter and Symbol Series question 15 of 18
Q16.Complete the series: ACE, GIK, MOQ, ?
Difficult
- ARTV
- BSTU
- CSUW
- DTVX
+Show Answer & Explanation
Answer: C. SUW
Explanation: Within each block letters step by 2, and each block starts 6 after the previous: M, O, Q → S, U, W.
Letter and Symbol Series question 16 of 18
Q17.Complete the series: Z, X, U, Q, ?
Difficult
- AK
- BL
- CM
- DN
+Show Answer & Explanation
Answer: B. L
Explanation: Positions 26, 24, 21, 17 with gaps −2, −3, −4 → next gap −5 gives 12 = L.
Letter and Symbol Series question 17 of 18
Q18.Which letter is midway between the 5th and the 15th letter of the alphabet?
Moderate
- AI
- BJ
- CK
- DL
+Show Answer & Explanation
Answer: B. J
Explanation: The midpoint of positions 5 and 15 is 10, which is J.
Letter and Symbol Series question 18 of 18

Letter and Symbol Series — Frequently Asked Questions

What is the EJOTY trick?+

It fixes five anchor letters — E = 5, J = 10, O = 15, T = 20, Y = 25 — so you can count forward or backward at most two letters from an anchor instead of counting from A every time.

How do I find the opposite letter quickly?+

Subtract the letter's position from 27. D is 4, so its opposite is the 23rd letter, W.

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