Series Questions for SSC CHSL, Download Free PDF

Are you ready to face the SSC CHSL Reasoning section? I have personally analyzed previous year reasoning questions and found that most questions are easy. There are some topics where aspirants get stuck, series is one of them. It might be possible that you have seen a sequence like 3, 7, 15, 31… and your mind goes blank. To avoid these common issues, we have provided a free PDF that consists of the most frequently asked exam-level series questions for SSC CHSL. Before that, attempt free series tests to test your preparation level.

Why is Series So Important for the SSC CHSL Exam?

Series Questions are pattern-based questions where a sequence of numbers, letters, or mixed terms follows a logical rule. You need to find the missing term or identify the wrong one. It is one of the most scoring topics of the General Intelligence/Reasoning section.

1. High Frequency: You can expect 3-5 questions from Number Series, Alphabet Series, or Mixed Series in every shift of the exam. These are easy marks if you know the pattern.
2. Speed Decider: Getting stuck on a series of questions can waste your time for the entire Reasoning section. Mastering these patterns helps you maintain a high speed.
3. Pattern Repetition: SSC often repeats the underlying logic (e.g., difference of squares, alternating addition) in different series. Practice allows you to spot these repeating traps.

Download Your Free SSC CHSL Series Questions PDF

Here, we have provided a PDF that contains exam-level series questions for SSC CHSL exam. Solving these questions will help you know what types of questions SSC asks in the exam, the difficulty level of the questions, and the pattern of the questions. Once you learn all these things carefully, you can easily attempt these questions in the exam in a very short time. So, download the Series Questions for SSC CHSL PDF for free and start solving the questions.

Download Free PDF of Series Questions for SSC CHSL

Question 1: Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

A ­_ E R _ _ L _ R T A _ E _ T _ L _ R T

A) L, T, E, L, A, A, R, E

B) E, L, L, T, A, R, A, E

C) L, T, A, E, L, R, A, E

D) L, A, E, T, L, A, E, R

Question 2: A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

AG, DK, GO, JS, MW, [?]

A) QX

B) PA

C) RY

D) AP

Question 3: Select the combination of letter when placed sequentially in the blanks of the given series will complete the series.

C __ L __ C O __ T __ O L __ C __ __ T

A) O, T, T, L, C, O, L

B) O, T, C, T, O, L, L

C) O, T, L, C, T, O, L

D) O, L, C, O, L, O, L

Question 4: Which letter-cluster will replace the question mark (?) in the following letter-cluster series?

YQR, ART, CSV, ETX, GUZ, [?]

A) IVB

B) JWC

C) IBV

D) KXD

Question 5: Which of the following will replace the question mark (?) in the following series?

19, 26, 38, 56, 81, [?]

A) 139

B) 114

C) 125

D) 146

Question 6: Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series.

A B _ A B C A _ B _ _ A B C _ D E

A) A, A, C, C, D

B) A, B, C, D, C

C) B, B, C, C, D

D) A, B, B, C, D

Question 7: In the following question, select the wrong number from the given alternatives.

32, 8, 16, 4, 48, 120, 360

A) 48 and 120

B) 16 and 4

C) 32 and 8

D) 8 and 4

Question 8: A series is given with two terms missing. Select the correct alternative from the given ones that will complete the series.

13, 26, 39, ____, 104, 169, _____.

A) 75 and 313

B) 52 and 276

C) 65 and 203

D) 65 and 273

Question 9: A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

HYR, ECM, BGH, _____, VOX

A) YCK

B) YKC

C) CKL

D) YLC

Question 10: Which letter cluster will complete the given series?

QJ, ____, TG, WD, AZ, FU

A) JR

B) RI

C) JM

D) RL

Download Free PDF of Series Questions for SSC CHSL

Types of Series Questions Asked in SSC CHSL

To help you prepare effectively, we’ve categorized the most common types of series questions that SSC repeatedly asks in the CHSL exam.

Number Series

Concept:
In Number Series, you are given a sequence of numbers that follow a mathematical pattern — addition, subtraction, multiplication, division, or a mix of these.

Example:
2, 6, 12, 20, 30, ?
Solution: +4, +6, +8, +10 → Next difference = +12
Answer: 42

Pro Tip: Always look at the difference between consecutive terms — the pattern usually lies there!

Alphabet Series

Concept:
In these questions, alphabets follow a fixed pattern based on their positions in the English alphabet (A=1, B=2, C=3…).

Example:
A, C, F, J, O, ?
Solution: +2, +3, +4, +5 → Next +6
Answer: U

Pro Tip: Learn the positions of letters by heart. It saves time during the exam!

Alphanumeric Series

Concept:
These questions combine letters, numbers, and sometimes symbols. You must find the missing term or identify a code pattern.

Example:
A1, C3, F6, J10, ?
Solution: Letter jumps +2, +3, +4; Numbers increase by +2, +3, +4 → Next = O15
Answer: O15

Pro Tip: Separate the alphabet and number pattern to spot logic faster.

Mixed Series

Concept:
A combination of numbers and letters following two parallel patterns. These are slightly trickier but high-scoring if you decode both sides.

Example:
B2, D4, G7, K11, ?
Solution:
Letters: +2, +3, +4 → Next +5 → P
Numbers: +2, +3, +4 → Next +5 → 16
Answer: P16

Missing Number Series (Box/Matrix Type)

Concept:
In these, numbers are arranged in a box or table, and you must find the missing number using arithmetic or logic rules.

Example:
| 5 | 7 | 12 |
| 9 | 11 | ? |

Solution: (5 + 7 = 12), (9 + 11 = 20)
Answer: 20

Pro Tip: Look for row-wise or column-wise patterns — SSC loves using these small tricks!

Attempt Free SSC CHSL Reasoning Topic Tests

3 Golden Tricks to Crack Any Series Question

Here, we have provided 3 golden tricks that will help you crack any series question easily. You are strongly advised to go through these tricks and try to implement them while you attempt topic tests. Just reading these tricks will not help you in implementing them effectively.

1. Analyze the Difference

Think of the difference as the first clue. For most Number Series questions, this step alone will reveal the logic.

• Look for the addition and subtraction: If the numbers are growing or shrinking gradually, it’s usually a straight-up Addition or Subtraction game. Just note the difference between each pair.
  • Example: In the series 2, 5, 8, 11… the pattern is simply adding 3 every single time.
• Spotting Bigger Gaps: If the numbers are increasing quickly, the difference itself is following a pattern! This is called the “Difference of Differences” or “Second Difference” method. Check the space between the differences. This often points to a sequence of +1, +2, +3, or perhaps a multiplication pattern.
  • Example: For 1, 2, 4, 7, 11…, the differences are +1, +2, +3, +4. The pattern is revealed in the second step!

2. Master the Alphabet Series

Don’t count on your fingers in the exam—it wastes valuable seconds! For any Alphabet Series problem, you must immediately translate the letters into their numerical values.

• Learn Positioning of Letters: Always write the fixed numerical position right below the letter (A=1, B=2, Z=26). This converts a letter puzzle into a much simpler Number Series problem!
• Alternative Checks: If the numerical pattern is tricky, shift your focus to common non-numerical traps:
  • Vowel/Consonant Pattern: Is the series just moving through Vowels (A, E, I…) or skipping a fixed number of Consonants?
  • Opposite Pairs: Check if the sequence involves famous ‘Opposite Pairs’ like A-Z, B-Y, C-X.

3. Look for Multiplication and Squares

If the looking series and numbers are growing rapidly from one term to the next, like 5, 26, 126, 626, then there is a possibility of the use of square, cube, and simple multiplication of any number:

• The Multiplier Effect: The pattern is likely multiplication, often with a small adjustment: (Number x2 or x3) ± a Constant.
• Squares and Cubes are Hidden! In most of the questions, there is a use of square and cube, but you are unable to find them. This is the biggest pattern trap. The numbers themselves are usually not perfect squares, but are just one step away. Check if the numbers are very close to the squares (N² ± 1) or cubes (N³ ± 1) of consecutive numbers.
  • Example: In 10, 17, 26, 37…, you realize these are just the squares of 3, 4, 5, 6… with one added to each: 3²+1, 4²+1, 5²+1, 6²+1. This trick cracks the question instantly!

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FAQs: Series Questions for SSC CHSL