Reasoning Chapters

1. NUMBER AND LETTER SERIES2. ALPHANUMERIC SERIES3. MISSING NUMBER4. ANALOGY SIMILARTY5. CLASSIFICATION6. DIRECTION 7. BLOOD RELATION8. SEATING ARRANGEMENT9. PUZZLE10. ORDER AND RANKING11. SYLLOGISM12. CLOCK13. CALENDER14. WORD FORMATION15. DICE16. CUBE AND CUBOID17. MIRROR AND WATER IMAGE18. VENN DIAGRAM19. STATEMENT AND ASSUMPTION

Alphanumeric Series

Alphanumeric series is a combination of alphabets, numbers, and sometimes symbols arranged in a particular pattern. The questions test your ability to detect and decode logical sequences.

What is an Alphanumeric Series?

An alphanumeric series includes a sequence made up of both letters and numbers, sometimes interspersed with symbols. The objective is to find the missing term or identify the pattern.

Common Patterns Used:

  • Number pattern (increment/decrement)
  • Letter pattern (alphabetical positions)
  • Alternating positions
  • Interchanging positions
  • Repetition or skips in sequence

Example:

Q: A1, B2, C3, D4, ?
Ans: E5

30+ Previous Year Questions with Solutions

  1. SSC CHSL 2020: A1, C3, E5, G7, ?
    Answer: I9 (Letters skip one, numbers +2)
  2. RRB NTPC 2019: Z9, Y8, X7, W6, ?
    Answer: V5 (Letters reverse, numbers –1)
  3. SSC CGL 2018: D4, G7, J10, M13, ?
    Answer: P16 (Letter +3, number +3)
  4. HSSC JE 2019: B1, D3, F5, ?
    Answer: H7 (Letter +2, number +2)
  5. SSC MTS 2021: A2, C6, E12, G20, ?
    Answer: I30 (Pattern in numbers: +4, +6, +8, +10)
  6. SSC GD 2019: 1A, 2B, 3C, 4D, ?
    Answer: 5E (Number+1, Letter+1)
  7. RRB Group D 2018: M13, L12, K11, ?
    Answer: J10 (Letter -1, Number -1)
  8. SSC CGL 2020: A2Z, B3Y, C4X, ?
    Answer: D5W (Letter +1, Number +1, Reverse Alphabet -1)
  9. SSC CPO 2016: A1B, C2D, E3F, ?
    Answer: G4H
  10. SSC JE 2018: 2B, 4D, 6F, ?
    Answer: 8H (Even Numbers, Letters +2)
  11. SSC CHSL 2017: P20, O19, N18, ?
    Answer: M17 (Letter -1, Number -1)
  12. RRB ALP 2017: A1Z, C3X, E5V, ?
    Answer: G7T (Letter +2, Number +2, Last letter -2)
  13. HSSC Clerk 2016: 3C, 5E, 7G, ?
    Answer: 9I (Number +2, Letter +2)
  14. SSC MTS 2016: Z1, X2, V3, T4, ?
    Answer: R5 (Letter -2, Number +1)
  15. SSC CGL 2015: L1K, J2I, H3G, ?
    Answer: F4E (Letter -2, Number +1)
  16. SSC JE 2021: A1B2, C3D4, E5F6, ?
    Answer: G7H8
  17. SSC CGL 2022: Z9Y, X8W, V7U, ?
    Answer: T6S (Letters -2, Numbers -1)
  18. SSC CHSL 2015: M5N, O6P, Q7R, ?
    Answer: S8T
  19. SSC GD 2022: A9Z, B8Y, C7X, ?
    Answer: D6W
  20. RRB NTPC 2020: D4X, E5Y, F6Z, ?
    Answer: G7A
  21. SSC CGL 2023: 1A2, 3B4, 5C6, ?
    Answer: 7D8
  22. SSC CHSL 2014: A1, C2, E3, ?
    Answer: G4
  23. SSC CGL 2017: K5M, I4K, G3I, ?
    Answer: E2G
  24. HSSC Group D 2019: X1Y, V2W, T3U, ?
    Answer: R4S

Tips to Solve Alphanumeric Series

  • Check letter patterns using alphabet positions (A=1, B=2, ..., Z=26).
  • Check numeric pattern separately (arithmetic, geometric, alternating).
  • Look for interleaved or alternating logic.
  • For complex series, try decoding letter and number logic independently.
  • Practice daily to increase speed and pattern recognition.
StartPreparation