Alphabet
series
🔶 1. Understanding the
Alphabet System
🔹 Alphabet Positions
|
Letter |
Position |
Reverse Position |
|
A |
1 |
26 |
|
B |
2 |
25 |
|
C |
3 |
24 |
|
... |
... |
... |
|
Z |
26 |
1 |
✅ Tip: Memorize A–Z
positions both normally and in reverse.
🔶 2. Categories of
Alphabet Series
Alphabet series questions can appear in various formats.
Mastering these categories improves accuracy and speed.
🔸 A. Single Letter Series
Pattern involves a progression of individual letters.
Examples:
- A,
C, E, G, ? → +2 increment → I
- M,
N, O, P, ? → +1 → Q
What to look for:
- Is
the series increasing/decreasing?
- What’s
the gap between letters?
🔸 B. Alternating Series
Letters alternate between different sequences or patterns.
Examples:
- A,
Z, B, Y, C, ? → First seq: A, B, C; Second: Z, Y, ? → X
- D,
G, J, M, ? → +3 each → P
🔸 C. Reversing Letters or
Mirror Logic
A letter corresponds to its mirror (e.g., A ↔ Z).
Common mirror pairs:
- A ↔
Z, B ↔ Y, C ↔ X, ..., M ↔ N
Examples:
- A,
Z, B, Y, C, X → Mirror pairs
- M,
L, K, J, ? → -1 steps → I
🔸 D. Alphanumeric Series
Combines letters and numbers. Both components may
follow distinct patterns.
Examples:
- A1,
B2, C3, D4 → +1 in both parts
- A2,
C4, E6 → letters +2, numbers +2
🔸 E. Multiple-Letter
Blocks
More than one letter per term (e.g., AZ, BY, CX).
Examples:
- AZ,
BY, CX, ?
→ First letters: A, B, C → +1
→ Second letters: Z, Y, X → -1
→ Next = DW
🔸 F. Series with
Mathematical Relationships
Involve mathematical logic such as:
- Prime
gaps: A, C, F, K → +2, +3, +5, ...
- Squares/Cubes:
A1, B4, C9, D16 → 1², 2², 3²...
🔶 3. Common Patterns to
Practice
|
Pattern Type |
Example |
Rule |
|
+1 or -1 Step |
A, B, C, D, ? |
Add 1 → E |
|
Skipping Letters |
A, C, E, G, ? |
+2 steps → I |
|
Mirror Pattern |
A, Z, B, Y, ? |
A↔Z, B↔Y → C↔X → X |
|
Alternating Logic |
A, D, B, E, C, F → ? |
First seq: A, B, C; second: D, E, F |
|
Reversal Logic |
M, L, K, J, ? |
-1 steps → I |
|
Alphanumeric Combo |
A1, B2, C3, ? |
+1 in both |
|
Word Formation |
ABC, CDE, EFG → ? |
Shifting window by 2 |
🔶 4. Strategy to Crack
Any Alphabet Series
✅ Step-by-Step Approach
- Convert
all letters to their numeric positions.
- Find
numerical patterns (add, subtract, multiply, alternate, etc.).
- Check
for alternating or mirrored patterns.
- Work
backward if the end is clearer than the beginning.
- If
alphanumeric, treat numbers and letters separately.
✅ Must-Know Shortcuts
|
Shortcut |
Example |
|
A = 1, Z = 26 |
Helps find position quickly |
|
Opposites = 27 (A + Z) |
A=1, Z=26 → 1+26=27 |
|
Alphabets repeat every 26 |
Useful in circular logic |
|
A↔Z, B↔Y pattern is common |
In tough series |
🔶 5. Common Traps and
Mistakes
|
Mistake |
How to Avoid |
|
Ignoring alternating sequences |
Check every other term if pattern breaks |
|
Treating letters as indivisible |
Always convert to numbers |
|
Overthinking simple patterns |
Try simple +1 or -1 first |
|
Mixing up alphabetical and numeric logic |
Separate them and solve independently |
🔶 6. Examples (Fully
Solved)
Example 1:
Q. A, C, F, J, O, ?
Convert to positions:
A(1), C(3), F(6), J(10), O(15)
Gaps: +2, +3, +4, +5
Next: +6 → 15 + 6 = 21 → U
Example 2:
Q. AZ, BY, CX, ?
First letters: A, B, C → +1 → D
Second letters: Z, Y, X → -1 → W
Answer: DW
Example 3:
Q. A1, C3, E5, G7, ?
Letters: A(1), C(3), E(5), G(7) → +2
Numbers: 1, 3, 5, 7 → +2
Next = I9
🧠 Pro Tips for Exams
- Practice
with timed quizzes to build speed.
- Make
a quick mental map of the alphabet (A–Z and Z–A).
- Build
muscle memory using flashcards or mnemonics.
- In
a tough series, start from the end or middle to spot easier logic.
- If
two patterns are present, analyze odd and even terms separately.
✅ Alphabet Series Practice
Questions
🔹 Easy Level (1–10)
- A,
B, C, D, ___
- A,
C, E, G, ___
- Z,
Y, X, W, ___
- B,
D, F, H, ___
- M,
N, O, ___
- A,
D, G, J, ___
- Z,
X, V, T, ___
- A,
Z, B, Y, C, ___
- C,
F, I, L, ___
- AZ,
BY, CX, DW, ___
🔹 Moderate Level (11–20)
- D,
G, J, M, ___
- K,
J, H, E, ___
- A1,
C3, E5, G7, ___
- Z,
W, S, N, ___
- B,
E, H, K, ___
- A,
D, H, M, ___
- C,
F, J, O, ___
- Z,
X, U, Q, ___
- AZ,
CX, EV, GT, ___
- M,
L, J, G, ___
🔹 Difficult Level (21–30)
- A1,
B2, D4, G7, ___
- AZ,
BY, CX, DW, ___
- A,
C, F, J, O, ___
- B,
D, G, K, P, ___
- Z1,
Y3, X5, W7, ___
- M,
P, T, Y, ___
- C,
D, F, I, M, ___
- B,
E, J, Q, ___
- A,
E, J, P, ___
- A2,
E5, J10, P17, ___
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