Number reasoning MCQs are designed in order to determine your understanding of number series. In such tests, a series of numbers are provided. The numbers are called terms of sequences. These terms are arranged in a set of predefined rules. To answer such questions one has to carefully study the given series and then find the specific pattern on the basis of which terms are progressing. In this article, MCQs.net shares the different types of number series on the basis and solved examples for each type.

## Arithmetic Number Series

In this type of series, the difference between any two consecutive terms is always the same and is known as a common difference. Each successive number is obtained by adding or subtracting a fixed number to the previous number.

### Examples:

Insert the missing number in series

Example 1

#### 1, 3, 5, 7, 9, ___

- 10
- 11
- 12
- 13

Correct answer: 2. 11

**Solution:**

Follow the series

- 1 + 2 = 3
- 3 + 2 = 5
- 5 + 2 = 7
- 7 + 2 = 9
- 9 + 2 = 11

Example 2

#### 2, 6, 10, 14, 18, ____

- 16
- 20
- 22
- 24

Correct answer: 3. 22

**Solution:**

Follow the series

- 2 + 4 = 6
- 6 + 4 = 10
- 10 + 4 = 14
- 14 + 4 = 18
- 18 + 4 = 22

Example 3

## 5, 8, 11, 14, 17, ___

- 18
- 19
- 20
- 21

Correct answer: 3. 20

*Solution*

Follow the series

5 + 3 = 8

8 + 3 = 11

11 + 3 = 14

14 + 3 = 17

17 + 3 = 20

Example 4

10, 12, 14, 16, 18, ___

- 19
- 20
- 21
- 22

Correct answer: 2. 20

**Solution**

Follow the series

- 10 + 2 = 12
- 12 + 2 = 14
- 14 + 2 = 16
- 16 + 2 = 18
- 18 + 2 = 20

Example 5

Insert the missing number in series

15, 20, 25, 30, 35, *_*

- 36
- 37
- 38
- 40

Correct answer: 4. 40

**Solution**

Follow the series

15 + 5 = 20

20 + 5 = 25

25 + 5 = 30

30 + 5 = 35

35 + 5 = 40

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