Number & Letter Series Guide & Practice

Foundation & Concepts

1. Letter Series Foundation

• Alphabetical Positions: Standard (A=1...Z=26).
• EJOTY Concept: E=5, J=10, O=15, T=20, Y=25. Helps locate any letter quickly.
• RHS Counting: To find the position of a letter from the Right Hand Side (Z to A), use: 27 - (Position from Left).
  • Example: The 10th letter from the left (J) is the (27-10) = 17th letter from the right.
• Central Letter: To find the middle letter between two positions from the same side, take the average of their positions.
  • Example: Middle of 12th (L) and 20th (T) is (12+20)/2 = 16th (P).

2. Number Series Foundation

• Sequence: A set of numbers following a specific mathematical rule.
• Common Logic:
  • Addition/Subtraction (Constant or increasing/decreasing difference).
  • Multiplication/Division.
  • Squares and Cubes (n², n³, n²+1, etc.).
  • Fibonacci (Sum of previous two terms).

Patterns/Rules

1. Arithmetic Series: Difference between consecutive terms is constant.
2. Geometric Series: Each term is multiplied/divided by a constant factor.
3. Alternating Series: Two or more different patterns running in parallel (e.g., terms 1, 3, 5 follow one rule; terms 2, 4, 6 follow another).
4. Mixed Operator: Using multiple operations, e.g., (Term * 2) + 3.
5. Letter Clusters: Patterns applied to groups of letters (e.g., SCD, TEF, UGH...).
6. Continuous Pattern Series: Small letters with blanks that form a repeating rhythmic pattern (e.g., abc_bc_ab_).

Typical Exam Weightage

In Banking Prelims this is typically a dedicated 5-question set — pattern-recognition speed matters more than any formula.

Figures are typical ranges based on recent-year patterns, not a guarantee for any specific upcoming paper — always cross-check against the latest official syllabus and previous-year papers for Number & Letter Series.