Series for SSC CHSL | Concepts & Practice | SSC CHSL Reasoning Ability

Learn the shortcut

Understand the fastest pattern for this topic before you attempt full MCQs.

Avoid common traps

See where students commonly lose marks so you can eliminate bad options earlier.

Solve faster in exam

Apply one practical method before attempting MCQs and cut down hesitation.

Summary Formula Tricks Mistakes Solved Example Practice FAQ

Series revision for SSC CHSL: understand the relation, apply the correct logical method, avoid assumptions and practise under time.

Series questions ask for the next or missing term in number, letter or mixed sequences. Patterns may involve differences, ratios, alternation, squares, primes or alphabet shifts.

SSC CHSL focus: Identify the relation or positional rule first, then solve with the shortest valid reasoning path and verify the final option.

Series revision: rule → diagram/relation → option check → timed practice → error review.

Core relation
Fast method
Common trap
Approved practice

Check first differences, second differences, ratios and alternating patterns before attempting complex rules.

Prefer the simplest rule that explains every term. A rule fitting only the last two terms is not enough.

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Translate the wording into a small diagram, relation or rule.
Use only information stated or logically forced by the question.
Eliminate options only after the core relation is clear.

Adding assumptions that are not given.
Reversing left/right, rank direction or relationship direction.
Choosing a familiar-looking option before testing the rule.

Practice example: Find the next number in the pattern: 5, 8, 14, 23, 35, ?

Solution: The next number is 50.

Find the next term: 81, 27, 9, 3, 1, ?
Find the next letter in the series: A, C, F, J, O, ?
For Series, choose the pair with the same relation as Book : Reading.

Learn the shortcut first

Shortcut before you solve

Series questions become easier when you inspect the gap pattern before looking at options.

Faster solving steps

Use this 4-step method before solving to keep your thinking fast and repeatable.

Step 1 Identify relation

Spot the pattern, relationship, or core idea first.

Step 2 Apply same pattern

Use the same rule instead of re-solving from scratch.

Step 3 Eliminate wrong options

Remove confusing choices before comparing the last few.

Step 4 Confirm final answer

Pick the option that matches the shortcut most cleanly.

Practice Questions

Start with the first 10 questions free, then unlock the rest with premium

Now apply the trick on real questions

Use the shortcut above before solving these questions

Check first difference, second difference, and basic multiplication patterns before guessing.

Tip: If the gap between terms is not fixed, check whether the differences themselves form a pattern.

Step 1

Each term is multiplied by 2.

Step 2

16 x 2 = 32.

Rule

The same pattern must continue from one term to the next.

3-second trick

Test the simplest pattern first: +, -, x, /, squares, or doubling.

Trap to avoid

Jumping to a complex pattern before checking the easy one.

Correct answer

32

Thinking path

2 becomes 4, then 8, then 16.
The rule is doubling.
So the next term is 32.

Final answer: 32

Why this is fast: Starting with common patterns saves time in most series questions.

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Q1 Medium

Find the next letter in the series: A, C, F, J, O, ?