SSC GD Constable Exam is one of the most popular competitive exams for aspirants willing to serve the nation as CISF, BSF, CRPF, etc. If you are preparing for it, you already know that the General Intelligence and Reasoning section is a place where you can score full marks. During analysis of this exam, I found a topic named series, which can secure your 2-4 marks. Questions from this section look easy, but they can take up most of your exam time. If you want to solve these questions easily in less time, then you must practice exam-level questions. For that, we have provided this blog in which you will get a free PDF of series questions for SSC GD exam and a basic concept of this topic. Before that, you are strongly advised to take some free topic tests so that you can get familiar with the exam pressure.
What are Series Questions? Why are they Important?
In Series questions, the examiner gives you a sequence of numbers or letters that follow a specific logic. Your job is to find the missing term or the wrong term.
Example: 2, 4, 8, 16, ?
Logic: Every number is multiplied by 2.
Answer: 32.
In the SSC GD exam, this topic is critical because:
- High Weightage: It covers a significant part of the Reasoning section.
- Brain Exercise: Solving these questions warms up your brain for other sections.
- Speed: Once you know the common patterns (squares, cubes, differences), you can solve them in seconds.
SSC GD Series: Important Patterns to Master
You don’t need to be a math genius. You just need to know these common patterns:
| Pattern Type | Explanation & Example |
| Difference Series | The difference between numbers is constant or increasing. (e.g., +2, +4, +6). |
| Square/Cube Series | Numbers are squares or cubes. (e.g., 4, 9, 16, 25…). |
| Multiplication Series | Numbers increase very fast. (e.g., 3, 9, 27, 81…). |
| Mixed Series | Two operations happen together (e.g., x2 + 1). |
| Letter Series | Alphabet positions change (e.g., A, C, E, G…). |
Download Free PDF of Series Questions for SSC GD
We have prepared a comprehensive PDF containing exam-level Series questions. Solving these questions will help you recognize patterns instantly. This PDF covers Number Series, Alphabet Series, and Repeated Series. It is designed to be a quick revision tool for you. You can download it for free and save it on your phone or computer to revise whenever you want.
Q1. Find the missing number in the series:
5, 11, 24, 51, 106, ?
(a) 217
(b) 215
(c) 220
(d) 210
Answer: (a) 217
(Logic: x2 + 1, x2 + 2, x2 + 3, x2 + 4. So, 106 x 2 + 5 = 217)
Q2. Select the letter-cluster that will replace the question mark:
ACG, EGK, IKO, MOS, ?
(a) QSW
(b) QSV
(c) QSU
(d) QTW
Answer: (a) QSW
(Logic: +4 shift in every letter. A+4=E, E+4=I, I+4=M, M+4=Q. Same for others.)
Q3. Find the missing number:
4, 9, 25, 49, 121, ?
(a) 144
(b) 169
(c) 196
(d) 225
Answer: (b) 169
(Logic: Squares of prime numbers. 2^2, 3^2, 5^2, 7^2, 11^2. The next prime is 13. 13^2 = 169)
Q4. Complete the series:
12, 22, 42, 72, ?
(a) 92
(b) 102
(c) 112
(d) 122
Answer: (c) 112
(Logic: The difference is increasing by 10. +10, +20, +30. Next is +40. 72 + 40=112)
Q5. Find the next term:
Z, X, V, T, R, ?
(a) O
(b) P
(c) Q
(d) S
Answer: (b) P
(Logic: -2 reverse skip. Z-2=X, X-2=V… R-2=P.)
Q6. Which number will replace the question mark?
2, 3, 6, 15, 42, ?
(a) 84
(b) 123
(c) 94
(d) 60
Answer: (b) 123
(Logic: Difference is powers of 3. +1 (3^0), +3 (3^1), +9 (3^2), +27 (3^3). Next is +81 (3^4). 42+81=123)
Q7. Find the missing term:
AZ, CX, EV, GT, ?
(a) IR
(b) KP
(c) JQ
(d) HS
Answer: (a) IR
(Logic: Opposite letter pairs with +2 gap. A+2=C, C+2=E… G+2=I. Opposite of I is R.)
Q8. 7, 8, 16, 43, ?
(a) 107
(b) 112
(c) 85
(d) 130
Answer: (a) 107
(Logic: Difference is cubes. 1^3, 2^3, 3^3. Next is 4^3 (64). 43+64=107)
Q9. Select the option that will complete the series:
ab_d_bc_a_c
(a) c, a, d, b
(b) c, d, a, b
(c) d, c, a, b
(d) c, a, d, d
Answer: (a) c, a, d, b
(Logic: Repeated pattern ‘abcd’. abcd / abcd / abcd.)
Q10. 100, 50, 52, 26, 28, ?, 16, 8
(a) 30
(b) 32
(c) 14
(d) 16
Answer: (c) 14
(Logic: Divide by 2, then add 2. 100/2=50, 50+2=52. 52/2=26, 26+2=28. 28/2=14)
How to Prepare Series Questions for SSC GD?
Here, we have provided some tips that will help you master Series questions for the SSC GD 2025 exam. Follow these tips and implement them while practicing.
- Learn Squares and Cubes: This should be your priority. Memorize squares up to 30 and cubes up to 15. Many questions are direct applications of this.
- Check the Difference First: If you see a number series, the first thing to do is find the difference between the numbers. 80% of questions are solved just by checking the difference (or the difference of the difference).
- Don’t Get Stuck: If you cannot find the logic in 30 seconds, skip it. Series questions can be traps. Solve the easy ones first and come back to the tricky ones later.
- Write the Alphabet: As soon as the exam starts, write A to Z on your rough sheet with their numbers (1-26). This helps immensely in Letter Series questions.
- Practice Daily Our Free Topic-wise Tests: Reasoning requires muscle memory. Practice at least 20 Series questions daily. Use our free topic-wise tests and analyze your mistakes. Taking these tests will help you improve your speed and accuracy.
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FAQs: Reasoning Series Questions for SSC GD
You can expect at least 2–4 questions from the Series in the Reasoning section. It is a very high-scoring topic.
They can range from Easy to Moderate. If you know the basic patterns (squares, cubes, multiplication), they are easy.
The only way is practice. The more questions you solve, the faster your brain recognizes the pattern. Also, memorizing squares and cubes helps a lot.
You can download the free PDF provided in this blog. It contains exam-level questions based on previous years’ papers.
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