Every series has a hidden logic or pattern. Your job is to crack this pattern and find the next or missing term. The pattern can be based on alphabetical order, numerical gaps, positional values, or combinations
A=1, B=2, C=3...
Fixed gaps between consecutive letters 3
Series going backwards in alphabet 4
Two different patterns running together 5
Even/odd positions follow different rules
- Alternate Series: Odd positions follow Pattern A, Even positions follow Pattern B
SSC loves testing gap-based series (+2, +3, +4 patterns), alternate letter series (AE, BF, CG type), and combination series mixing numbers with letters. Most questions are straightforward if you identify the core pattern quickly.
In any letter series, immediately check if there's a consistent gap between consecutive terms
A to D = gap of 3, D to G = gap of 3. If gaps match, you've found your pattern.
Break into individual letters: A-C, F-H, K-M, P-R
Find gaps in first letters: A(1) to F(6) = +5, F(6) to K(11) = +5, K(11) to P(16) = +5
Find gaps in second letters: C(3) to H(8) = +5, H(8) to M(13) = +5, M(13) to R(18) = +5
Pattern confirmed - both positions have +5 gap
Next term = P(16)+5 = U(21), R(18)+5 = W(23) Answer: UW Shortcut Trick #2 - The 'Alphabet Skip Method': When you see letters with big gaps, convert to numbers immediately. It's faster to work with 1,6,11,16 than A,F,K,P. Worked Example 2: Complete the series: B2D, D6F, F18H, H54J, ?
Identify pattern structure - Letter+Number+Letter
First letters: B,D,F,H (gap of +2 each)
Last letters: D,F,H,J (gap of +2 each)
Middle numbers: 2,6,18,54
Number pattern: 2×3=6, 6×3=18, 18×3=54, 54×3=162
Next first letter: H+2=J, Next last letter: J+2=L Answer: J162L Shortcut Trick #3 - The 'Reverse Psychology': If normal alphabetical order doesn't work, try reverse order where A=26, B=25, etc. Many SSC questions use this trick. #1 Most Common Trap: Students often miss that a series has TWO separate patterns running simultaneously. They solve for one pattern and ignore the other. Always check if odd and even positions follow different rules. For example, in series ACF, BEH, the first letters follow +2 gap (A,B) while the second and third letters follow different patterns. Another major mistake is confusing alphabetical positions. Remember: A=1, not A=0. This single error can derail your entire solution. Time Management Tip: Spend maximum 90 seconds per series question. If pattern isn't clear in 30 seconds, try the reverse approach or skip and return later.
17graded MCQs · easy to hard · full solution & trap analysis