🧠 Introduction to Series Completion

What is Series Completion?

Series completion questions test your ability to identify patterns and logical relationships in sequences of numbers, letters, symbols, or combinations of these elements.

🌟 Key Concept: Every series follows a specific pattern or rule. Your task is to discover this pattern and predict the next element.

Types of Series

2, 4, 6, 8, ?
→
10
  • Number Series: Sequences of numbers following mathematical patterns
  • Alphabet Series: Sequences of letters following alphabetical patterns
  • Alpha-Numeric Series: Combinations of letters and numbers
  • Symbol Series: Sequences of symbols or figures

🔢 Number Series Patterns

Addition/Subtraction Patterns

Find the missing term: 3, 6, 9, 12, 15, ?
3
+3
6
+3
9
+3
12
+3
15
+3
?
Pattern: Add 3 to each term
Solution: 15 + 3 = 18
Answer: 18

Multiplication/Division Patterns

Find the missing term: 5, 25, 125, 625, ?
Pattern: Multiply by 5
Solution: 625 × 5 = 3125
Answer: 3125

Squares/Cubes Patterns

Find the missing term: 1, 4, 9, 16, 25, ?
Pattern: Squares of natural numbers (1², 2², 3², 4², 5², 6²)
Solution: 6² = 36
Answer: 36

Practice Exercise

Find the missing term: 2, 5, 10, 17, 26, ?
A. 29
B. 31
C. 35
D. 37
Pattern: Add consecutive odd numbers (3, 5, 7, 9, 11)
Solution: 26 + 11 = 37
Answer: D. 37

🔠 Alphabet Series Patterns

Basic Alphabet Patterns

Find the missing term: A, C, F, J, ?, ?
A
+2
C
+3
F
+4
J
+5
?
+6
?
Pattern: Add increasing numbers (2, 3, 4, 5, 6)
Solution: J + 5 = O, O + 6 = U
Answer: O, U

Practice Exercise

Find the missing term: B, D, F, I, L, P, ?
A. R
B. S
C. T
D. U
Pattern: Skip 1, 1, 2, 2, 3, 3 letters
Solution: P + 3 = S
Answer: C. T

🔣 Alpha-Numeric Series

Mixed Patterns

Find the missing term: Z5A, X4D, V6G, T3J, R7M, ?
Pattern Analysis:
1st letter: Z, X, V, T, R → Decreasing by 2
Number: 5, 4, 6, 3, 7 → Pattern: 5-1=4, 4+2=6, 6-3=3, 3+4=7
3rd letter: A, D, G, J, M → Increasing by 3
Solution: Next: P(1st), 7-5=2(number), M+3=P(3rd) → P2P
Answer: P2P

⚡ Symbol Series Patterns

Visual Pattern Recognition

Identify the next symbol in the sequence: ▲, ▼, ▶, ◀, ▲, ▼, ?
▲
▼
▶
◀
▲
▼
?
Pattern: Rotating arrow sequence (Up, Down, Right, Left, repeat)
Solution: Next after ▼ is ▶
Answer: ▶

💡 Quick Solving Tips

Look for Obvious Patterns First

Check for simple arithmetic operations (addition, subtraction, multiplication, division) before complex patterns.

Number Series Strategies

1. Check differences between terms
2. Check ratios between terms
3. Look for squares/cubes
4. Check prime numbers

Alphabet Series Tricks

Convert letters to numbers (A=1, B=2, etc.) to identify numerical patterns in alphabet series.

Symbol Series Approach

Look for: Rotation, Reflection, Color changes, Size changes, Position changes, Pattern repetition.

Time Management

Spend no more than 30-45 seconds on a single series. If stuck, move on and return later.