**Number Series Questions & Answers with Explanation- Test 1**

1) Which number should come next in the series, 48, 24, 12, ……?

- 8
- 6
- 4
- 2

**Answer:** 2

**Explanation:**

It is a simple division series in which each number is one-half of the previous number. We can also say that each number is divided by 2 to arrive at the next number;

On dividing 48 by 2, we get 24

On dividing 24 by 2, we get 12

So, on dividing 12 by 2, we will get 6

2) Look at the series, 46, 44, 40, 38, 34, _, which number should come next?

- 30
- 36
- 32
- 31

**Answer:** 3

**Explanation:**

We can see that it is an alternating number subtraction series; first 2 is subtracted then 4 is subtracted and then 2 is subtracted again and so on;

46 – 2 = 44

44 – 4 = 40

40 – 2 = 38

38 – 4 = 34

34 – 2 = 32

3) Which number would fill the empty space in the series; 4, 7, 12, 19, _, 39?

- 28
- 26
- 24
- 22

**Answer:** 1

**Explanation:**

In this series, the difference between the consecutive numbers increases by 2;

7 – 4 = 3

12 – 7 = 5

19 – 12 = 7

Therefore, the next number would be 19 + 9 = 28

4) Which number would replace the underline mark in the series 20, 40, 100, _, 820?

- 240
- 260
- 280
- 300

**Answer:** 3

**Explanation:**

In this series, the difference between consecutive numbers is multiplied by 3; 20, 60, 180, 540.

Therefore, the missing number would be 100 + 180 = 280

5) What are the missing numbers in this series, 15, 20, 24, 15, 28, 32 15, _, _, 15?

- 37, 41
- 36, 40
- 38, 42
- 40, 44

**Answer:** 2

**Explanation:**

This is a simple addition series in which the number “15” is interpolated as every third number. And, except 15, four is added to each number to arrive at the next number.

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