SSC CHSL Number Series Questions
7 questions on Number Series for SSC CHSL, including questions from 2024 papers. Each comes with the correct answer and a worked explanation.
- Questions
- 7
- Easy
- 2
- Moderate
- 5
Number Series questions with solutions
Select the number that will come next in the following series. 5, 10, 20, 40, 80, ?
- (A)240
- (B)159
- (C)158
- (D)160
Show answer and explanation
Correct answer: (D) 160
Each term is obtained by multiplying the previous term by 2. Applying the same pattern to the last given term 80 gives 160, which is the next number in the series.
Select the number that will come next in the following series. 2, 6, 12, 20, 30, ?
- (A)40
- (B)41
- (C)54
- (D)42
Show answer and explanation
Correct answer: (D) 42
The differences between consecutive terms increase by 2 each time (4, 6, 8, …). Applying the same pattern to the last given term 30 gives 42, which is the next number in the series.
Select the number that will come next in the following series. 12, 23, 34, 45, 56, ?
- (A)78
- (B)69
- (C)66
- (D)67
Show answer and explanation
Correct answer: (D) 67
Each term is obtained by adding 11 to the previous term. Applying the same pattern to the last given term 56 gives 67, which is the next number in the series.
Select the number that will come next in the following series. 16, 25, 36, 49, 64, ?
- (A)80
- (B)81
- (C)83
- (D)98
Show answer and explanation
Correct answer: (B) 81
The terms are the squares of consecutive numbers starting from 4. Applying the same pattern to the last given term 64 gives 81, which is the next number in the series.
Select the number that will come next in the following series. 7, 11, 17, 25, 35, ?
- (A)59
- (B)47
- (C)45
- (D)48
Show answer and explanation
Correct answer: (B) 47
The differences between consecutive terms increase by 2 each time (4, 6, 8, …). Applying the same pattern to the last given term 35 gives 47, which is the next number in the series.
Select the number that will come next in the following series. 64, 81, 100, 121, 144, ?
- (A)167
- (B)168
- (C)169
- (D)194
Show answer and explanation
Correct answer: (C) 169
The terms are the squares of consecutive numbers starting from 8. Applying the same pattern to the last given term 144 gives 169, which is the next number in the series.
Select the number that will come next in the following series. 4, 6, 10, 16, 24, ?
- (A)36
- (B)34
- (C)44
- (D)32
Show answer and explanation
Correct answer: (B) 34
The differences between consecutive terms increase by 2 each time (2, 4, 6, …). Applying the same pattern to the last given term 24 gives 34, which is the next number in the series.
Frequently asked questions
How many SSC CHSL Number Series questions can I practise here?
7 questions — 2 easy and 5 moderate. 7 are shown on this page with answers and explanations, and the practice set draws from all of them.
How should I practise Number Series for SSC CHSL?
Read through a few solved questions first to see the method, then take a timed practice set. Afterwards, check which questions you got wrong or spent longest on and redo those before moving on.