Bank Exam Speed Maths

Page 16: Number Series (Missing & Wrong Number Tricks)

1. Basic Concept

Number series questions test pattern recognition and logical thinking.

Find missing number or wrong number in sequence.

2. Common Patterns

• Addition / Subtraction

• Multiplication / Division

• Square / Cube

• Alternate Pattern

• Combination of operations

3. Example (Simple Pattern)

2, 4, 6, 8, ?

Pattern: +2

Answer: 10

4. Example (Square Pattern)

1, 4, 9, 16, ?

Pattern: Squares (1², 2², 3², 4²)

Answer: 25

5. Example (Mixed Pattern)

2, 6, 7, 21, 22, ?

Pattern: ×3, +1, ×3, +1

Answer: 66

6. Wrong Number Trick

Identify pattern first, then check which number breaks it

Example:
2, 4, 8, 15, 16
Pattern should be ×2 → wrong number = 15

7. Important Tips

• Check difference first

• Then check ratio

• Look for squares/cubes

• Identify alternating patterns

8. Practice Questions

1. 3, 6, 9, 12, ?

2. 5, 10, 20, 40, ?

3. 1, 8, 27, 64, ?

4. 2, 5, 10, 17, ?

5. Find wrong number: 4, 8, 16, 30, 32