## 1. Complete the series: 2, 4, 8, 16, ?

### Answer:

### Explanation:

Each number is multiplied by 2. So, 16 * 2 = 32.

## 2. Find the missing number: 5, 10, 15, ?, 25

### Answer:

### Explanation:

The pattern is adding 5 each time.

## 3. Complete the series: 3, 9, 27, ?

### Answer:

### Explanation:

Each number is multiplied by 3.

## 4. Find the missing number: 10, 20, 40, 80, ?

### Answer:

### Explanation:

Each number is doubling the previous one.

## 5. Complete the series: 1, 4, 9, 16, ?

### Answer:

### Explanation:

The series represents square numbers. 5^2 = 25.

## 6. Find the missing number: 2, 3, 5, 8, ?

### Answer:

### Explanation:

The pattern is adding the previous two numbers (3+5, 5+8).

## 7. Complete the series: 100, 90, 80, ?, 60

### Answer:

### Explanation:

The pattern is subtracting 10 each time.

## 8. Find the missing number: 7, 14, 28, 56, ?

### Answer:

### Explanation:

The series is each number times 2.

## 9. Complete the series: 1, 1, 2, 3, 5, ?

### Answer:

### Explanation:

This is the Fibonacci sequence, where each number is the sum of the two preceding ones.

## 10. Find the missing number: 2, 4, 8, ?, 32

### Answer:

### Explanation:

The pattern is each number multiplied by 2.

## 11. Complete the series: 3, 6, 12, 24, ?

### Answer:

### Explanation:

Each number is multiplied by 2.

## 12. Find the missing number: 1, 4, 9, ?, 25

### Answer:

### Explanation:

The series is square numbers. 4^2 = 16.

## 13. Complete the series: 11, 22, 33, 44, ?

### Answer:

### Explanation:

The pattern is adding 11 each time.

## 14. Find the missing number: 5, 10, 20, 40, ?, 160

### Answer:

### Explanation:

Each number is doubling the previous one.

## 15. Complete the series: 2, 6, 18, 54, ?

### Answer:

### Explanation:

Each number is multiplied by 3.

## 16. Find the missing number: 1, 8, 27, ?, 125

### Answer:

### Explanation:

The series is cube numbers. 4^3 = 64.

## 17. Complete the series: 3, 9, 27, 81, ?

### Answer:

### Explanation:

Each number is multiplied by 3.

## 18. Find the missing number: 4, 16, 64, ?, 1024

### Answer:

### Explanation:

The pattern is each number times 4.

## 19. Complete the series: 5, 11, 17, 23, ?

### Answer:

### Explanation:

The pattern is adding 6 each time.

## 20. Find the missing number: 10, 13, 16, 19, ?, 25

### Answer:

### Explanation:

The pattern is adding 3 each time.

## 21. Complete the series: 12, 24, 48, 96, ?

### Answer:

### Explanation:

Each number is doubled.

## 22. Find the missing number: 1, 3, 7, 15, ?

### Answer:

### Explanation:

The pattern is 2^n – 1.

## 23. Complete the series: 2, 3, 5, 7, ?

### Answer:

### Explanation:

The series consists of prime numbers.

## 24. Find the missing number: 20, 40, 60, ?, 100

### Answer:

### Explanation:

The pattern is adding 20 each time.

## 25. Complete the series: 6, 12, 24, 48, ?

### Answer:

### Explanation:

Each number is doubled.

## 26. Find the missing number: 3, 6, 9, 12, ?, 18

### Answer:

### Explanation:

The pattern is adding 3 each time.

## 27. Complete the series: 1, 8, 27, 64, ?

### Answer:

### Explanation:

The series is cube numbers. 5^3 = 125.

## 28. Find the missing number: 1, 2, 4, 8, 16, ?

### Answer:

### Explanation:

Each number is doubled.

## 29. Complete the series: 2, 6, 12, 20, ?

### Answer:

### Explanation:

The pattern is n(n+1).

## 30. Find the missing number: 100, 200, 300, ?, 500

### Answer:

### Explanation:

The pattern is adding 100 each time.

## 31. Complete the series: 4, 7, 11, 16, ?

### Answer:

### Explanation:

The series is increasing by consecutive odd numbers.

## 32. Find the missing number: 5, 10, 20, 40, 80, ?

### Answer:

### Explanation:

Each number is doubled.

## 33. Complete the series: 3, 9, 27, 81, 243, ?

### Answer:

### Explanation:

Each number is multiplied by 3.

## 34. Find the missing number: 1, 1, 2, 6, 24, ?

### Answer:

### Explanation:

The series is factorial numbers.

## 35. Complete the series: 2, 4, 7, 11, ?

### Answer:

### Explanation:

The pattern is increasing by 2, 3, 4, and so on.

## 36. Find the missing number: 5, 7, 11, 17, ?

### Answer:

### Explanation:

The series consists of consecutive prime numbers.

## 37. Complete the series: 10, 9, 8, 7, ?

### Answer:

### Explanation:

The series is decreasing by 1 each time.

## 38. Find the missing number: 1, 4, 9, 16, 25, ?

### Answer:

### Explanation:

The series is square numbers. 6^2 = 36.

## 39. Complete the series: 1, 2, 6, 24, 120, ?

### Answer:

### Explanation:

The series is factorial numbers.

## 40. Find the missing number: 2, 6, 18, 54, ?

### Answer:

### Explanation:

Each number is multiplied by 3.

## 41. Complete the series: 3, 8, 15, 24, ?

### Answer:

### Explanation:

The pattern is n^2+1.

## 42. Find the missing number: 100, 90, 80, ?, 60

### Answer:

### Explanation:

The series is decreasing by 10 each time.

## 43. Complete the series: 1, 1, 2, 3, 5, 8, ?

### Answer:

### Explanation:

This is the Fibonacci sequence, where each number is the sum of the two preceding ones.

## 44. Find the missing number: 2, 3, 5, 7, 11, ?

### Answer:

### Explanation:

The series consists of prime numbers.

## 45. Complete the series: 12, 14, 18, 24, ?

### Answer:

### Explanation:

The pattern is increasing by 2, 4, 6, and so on.

## 46. Find the missing number: 1, 8, 27, 64, 125, ?

### Answer:

### Explanation:

The series is cube numbers. 6^3 = 216.

## 47. Complete the series: 1, 2, 4, 7, 11, ?

### Answer:

### Explanation:

The pattern is adding 1, 2, 3, 4, and so on.

## 48. Find the missing number: 3, 6, 12, 24, 48, ?

### Answer:

### Explanation:

Each number is doubled.

## 49. Complete the series: 2, 3, 5, 8, 12, ?

### Answer:

### Explanation:

The pattern is adding 1, 2, 3, 4, and so on.

## 50. Find the missing number: 5, 11, 17, 23, 29, ?

### Answer:

### Explanation:

The series is increasing by 6 each time.