Introduction
Alphanumeric Series questions give a long sequence mixing letters, numbers, and symbols, then ask about specific
positions — "the 5th element from the right," "how many vowels are followed by an even number," and similar
counting-based questions.
Solving Approach
- Number each position in the sequence lightly above/below as you read it (1, 2, 3...) — don't try to count mentally under time pressure.
- For "from the right" positions, count from the end backward, or convert using: position from right = (total elements − position from left + 1).
- For "immediately followed/preceded by" conditions, scan element-by-element rather than jumping around.
- For grouping questions (e.g., "each symbol is immediately followed by a number that is immediately followed by a consonant"), check each triplet in sequence.
Q. In the series: 4 B % K 9 R $ 2 T @ M 7, how many symbols are immediately followed by a number?
Symbols in the series: % (followed by K — not a number), $ (followed by 2 — a number ✓), @ (followed by M — not a
number). Count = 1.
Q. In the same series (4 B % K 9 R $ 2 T @ M 7), find the 4th element from the right.
Total elements = 12. From the right: 7(1st), M(2nd), @(3rd), T(4th). So the 4th element from the right is
T.
⚠️ Key Insight: When a question combines two conditions (e.g., "a vowel immediately preceded by
an odd number and immediately followed by a symbol"), check ALL conditions for each candidate position — a
partial match doesn't count.
💡 Exam Tip: Rewrite long series on rough paper with position numbers marked every 5 elements —
this small habit prevents miscounting in series longer than 10-12 elements.
✅ Practice Focus: Position counting from left/right · "Immediately followed/preceded by"
conditions · Counting specific element-type occurrences · Reordering/rearranging series by rule.