Alphanumeric Series • Mixed series (letters, numbers, symbols)
Alphanumeric Series: Full-Length Notes
Topic Focus: Mixed Series (Letters, Numbers, Symbols)
1. What is an Alphanumeric Series?
An alphanumeric series is a sequence that combines letters (alphabets), numbers, and sometimes symbols, arranged in a logical pattern. Your task is to identify the rule and find the missing or next element in the sequence1267.
2. Types of Alphanumeric Series
Pure Alphabetic Series: Only letters, e.g., A, C, E, G, ?
Pure Numeric Series: Only numbers, e.g., 2, 6, 12, 20, ?
Alphanumeric Series: Both letters and numbers, e.g., A1, B2, C3, D4, ?
Mixed Series: Random mix of letters, numbers, and sometimes symbols, e.g., 3B, 5D, 7F, 9H, ?
Conditional/Code-Based Series: Series with conditions or coding, sometimes including symbols, e.g., AZ1, BY3, CX5, DW7, ?
3. Common Patterns in Alphanumeric Series
A. Sequential Series
Letters and numbers follow a simple, often arithmetic, progression.
Example: A1, B2, C3, D4, ?
Pattern: Letters and numbers both increase by 1.
Next: E5
B. Alternating Series
Letters and numbers alternate or skip in a fixed pattern.
Example: 1A, 2B, 3D, 4G, ?
Pattern: Numbers increase by 1; letters: A (1), B (2), D (4), G (7), increments: +1, +2, +3...
Next: 5K (K is 11th letter: 7 + 4)
C. Position-Based Series
The position of letters in the alphabet or numbers is used.
Example: A1, C3, E5, G7, ?
Pattern: Letters: A, C, E, G (odd positions); Numbers: 1, 3, 5, 7
Next: I9
D. Mathematical Operation Series
Numeric part follows arithmetic/geometric operations.
Example: A2, C6, E12, G20, ?
Pattern: Numbers: 2, 6, 12, 20 (differences: +4, +6, +8...)
Next: I30
E. Combination/Complex Series
Multiple patterns combined (letters, numbers, sometimes symbols).
Example: AB3, BC5, CD8, DE12, ?
Pattern: Letters shift by 1; numbers follow Fibonacci: 3, 5, 8, 12, 17...
Next: EF17
F. Code-Based Series
Uses coding or reverse order.
Example: A1Z, B2Y, C3X, D4W, ?
Pattern: First letter moves forward, number increases, last letter moves backward.
Next: E5V
G. Symbol-Inclusive Series
Includes symbols in the sequence.
Example: 2@A, 4#C, 6$E, ?
Pattern: Numbers +2, symbols change, letters skip one.
Next: 8%C
4. Approach to Solving Alphanumeric Series
Step 1: Observe the Pattern
Separate the sequence into components (letters, numbers, symbols).
Step 2: Analyze Each Component
For letters: Check alphabetical order, position, skipping, or reverse.
For numbers: Check arithmetic or geometric progression, squares, cubes, etc.
For symbols: Check if they follow a set or repeat in a cycle.
Step 3: Identify the Rule
Look for consistent changes in each part.
Check for alternating, skipping, or combined patterns.
Step 4: Apply the Rule
Predict the next or missing element accordingly.
5. Examples with Solutions
Example 1: Mixed Series
Q: 3B, 5D, 7F, 9H, ?
Numbers: 3, 5, 7, 9 (increase by 2)
Letters: B (2), D (4), F (6), H (8) (even positions, +2)
Next: 11J
Example 2: Pattern with Symbols
Q: 1A!, 2B@, 3C#, 4D$, ?
Numbers: 1, 2, 3, 4 (+1)
Letters: A, B, C, D (+1)
Symbols: !, @, #, $ (common sequence of symbols on keyboard)
Next: 5E%
Example 3: Conditional Series
Q: If A=1, B=2, C=3, find the 5th term in the series: 2A, 4C, 6E, 8G, ?
Numbers: 2, 4, 6, 8 (+2)
Letters: A (1), C (3), E (5), G (7) (+2)
Next: 10I
Example 4: Complex Pattern
Q: A9, B16, ?, D36, E49
Numbers: 9, 16, ?, 36, 49 (perfect squares: 3², 4², 5², 6², 7²)
Letters: A, B, C, D, E
Missing: C25
6. Common Tricks and Tips
Check for Skipping: Letters or numbers may skip by 2, 3, etc.
Reverse Order: Sometimes letters/numbers move forward and backward alternately.
Symbol Cycles: Symbols may follow a keyboard or logical sequence.
Multiple Patterns: Both letters and numbers may have their own, independent rules.
Position Value: Letters often represent their alphabetical position (A=1, Z=26).
7. Practice Question Types
Find the next element: What comes next in the series?
Find the missing element: What fills the blank?
Identify the pattern: What is the rule?
Odd one out: Which element does not fit the pattern?
8. Summary Table: Common Patterns
| Series Example | Pattern Description | Next Term |
|---|---|---|
| A1, B2, C3, D4 | Letters and numbers both +1 | E5 |
| 2B, 5C, 8D, 11E | Numbers +3, letters +1 | 14F |
| A2, D4, G6, J8 | Letters +3, numbers +2 | M10 |
| AB3, BC5, CD8 | Letters +1, numbers Fibonacci | DE12 |
| 1A!, 2B@, 3C# | Numbers +1, letters +1, symbols sequence | 4D$ |
| Z9, Y8, X7, W6 | Letters -1, numbers -1 | V5 |
9. References and Further Practice
[BYJU'S: Alphanumeric Series Reasoning]1
[Testbook: Alphanumeric Series]2
[BankersAdda: Alphanumeric Series]3
[Learntheta: Alphanumeric Series Concepts]5
[PracticeMock: Alphanumeric Series]6
Mastering alphanumeric series requires practice with all types—especially mixed and symbol-including patterns. Always break down the series, spot the pattern for each component, and check for alternation or cycles.
Find the Next Term / Missing Term
A1, B2, C3, D4, ___
2B, 4D, 6F, 8H, ___
X9, W8, V7, U6, ___
1A!, 2B@, 3C#, 4D$, ___
M5, N7, O9, P11, ___
3C, 6F, 9I, 12L, ___
5Z, 10Y, 15X, 20W, ___
A2B, C4D, E6F, G8H, ___
7G, 14H, 21I, 28J, ___
1A2, 3B4, 5C6, 7D8, ___
Q10, R12, S14, T16, ___
2B!, 4D@, 6F#, 8H$, ___
1A3, 2B5, 3C7, 4D9, ___
P5, R7, T9, V11, ___
9Z, 8Y, 7X, 6W, ___
1A*, 2B#, 3C$, 4D%, ___
10J, 8H, 6F, 4D, ___
2A, 5C, 10E, 17G, ___
B2, D4, F6, H8, ___
3C1, 6F2, 9I3, 12L4, ___
1A2B, 3C4D, 5E6F, 7G8H, ___
K5, J7, I9, H11, ___
2B3, 4D5, 6F7, 8H9, ___
1A!, 3C@, 5E#, 7G$, ___
4D, 8G, 12J, 16M, ___
Odd-One-Out
A1, B2, C3, D5, E4
2B, 4D, 6F, 8H, 10J
X9, W8, V7, U6, T5
1A!, 2B@, 3C#, 4D%, 5E$
M5, N7, O9, Q11, P13
3C, 6F, 9I, 12L, 16O
5Z, 10Y, 15X, 20W, 25U
A2B, C4D, E6F, G8H, I10J
7G, 14H, 21I, 28J, 35K
1A2, 3B4, 5C6, 7D8, 9E10
Find the Next Term / Missing Term (contd.)
2A2, 4C4, 6E6, 8G8, ___
1A1!, 2B2@, 3C3#, 4D4$, ___
5E, 10G, 15I, 20K, ___
1A3C, 2B4D, 3C5E, 4D6F, ___
2B, 5E, 10H, 17K, ___
1A*, 2C#, 3E$, 4G%, ___
11K, 13M, 15O, 17Q, ___
1A2B3, 4C5D6, 7E8F9, 10G11H12, ___
2B!, 4D#, 6F$, 8H%, ___
3C2, 6F4, 9I6, 12L8, ___
1A1A, 2B2B, 3C3C, 4D4D, ___
2B, 4E, 8H, 16K, ___
1A3, 2C5, 3E7, 4G9, ___
5Z, 10X, 15V, 20T, ___
1A!, 2C@, 3E#, 4G$, _
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