Series Tests — Pick a Level and Start
Tap a level to see every test in it. Level 1 is set at real SSC CGL difficulty — start there the day you finish the concept. Level 2 is pitched above the exam, to push accuracy under pressure.
Level 1 SSC CGL Level Checking… View tests
Same difficulty as the real SSC CGL paper — one clear rule per series. Constant gaps, gaps that rise or double, squares, cubes and primes, multiply-then-add, two interleaved series, wrong-term questions, letter skips, two-, three- and four-letter clusters, fill-the-blank repeat units and letter–number terms. A steady score here means the chapter is exam-ready.
Level 2 Above SSC CGL Level Checking… View tests
Harder than the exam asks. Rules are stacked two deep — gaps of gaps, multipliers that grow, ×n + n², three interleaved runs, two blanks at once, letters that wrap past Z, rotating and reversing repeat units, and numbers tied to the positions of their own letters. Wrong options are the slips students actually make: the repeated gap, the forgotten “+ 1”, the wrong power.
Every series question hides one rule that produces every term. Find that rule from the terms you can see, test it on all of them, and only then apply it to the blank — guessing from the last two terms alone is how the trap options win.
Marks are lost in three places. The first is stopping at the first level of gaps — when the gaps look random, their own gaps, ratios or squares usually settle. The second is missing an interleaved series, where odd and even places follow two separate rules. The third is miscounting letter positions — at Level 2 one letter off is exactly what the wrong options are built on.
How Many Series Questions Are Asked in SSC CGL?
Series is one of the steadiest chapters in SSC CGL reasoning — usually two to three questions in every Tier I shift and a few more in Tier II Paper I. About 375 non-figure series questions appeared in SSC papers from 2010 to 2024, and they split into four kinds.
| Kind of series | Share of past SSC series questions |
|---|---|
| Number series (next, missing or wrong term) | 48% |
| Letter & letter-cluster series | 34% |
| Letter-repeat series (fill the blanks) | 16% |
| Alphanumeric series (letters with numbers) | 3% |
Shares are from SSC CGL, CHSL, MTS, Steno and CPO papers, 2010–2024 (figure-based series are counted under Figure Series). The tests here follow the same balance — half number series, a quarter letter series and the rest repeat and alphanumeric series.
What You Will Practice in the Series Chapter
Number series
- Constant gaps, gaps that rise or fall by a fixed step, gaps that double or triple
- Gaps that are squares, cubes or primes; gaps of gaps
- Multiply by a constant or a growing number; multiply then add (×a + b, ×n + n)
- Squares and cubes of a running number, n(n + 1), n³ + n²
- Two or three interleaved series, alternating operations, sum of previous terms
- Wrong-term questions, two missing terms, decimals, fractions and negative terms
Letter series
- Single letters with constant, growing or alternating skips, and wrap-around after Z
- Two-, three- and four-letter clusters, each position on its own step
- Opposite letters (A–Z, B–Y), reversed groups and groups of changing length
- Continuous letter strings with two question marks, and word or number-word series
Letter-repeat and alphanumeric series
- Fill the blanks — fixed, rotating, growing, mirror and reversing units
- Capital-letter blocks with one moving letter, and digit strings
- Letter–number terms — a letter with its position, its square or its reverse position
- Root and subscript expressions, and numbers and letters taking turns
Values worth knowing instantly
| Item | What to remember |
|---|---|
| Position values | E = 5, J = 10, O = 15, T = 20, Y = 25 |
| Opposite letters | Positions add to 27 — A–Z, B–Y, M–N |
| Reverse position | 27 − position (Z = 1, Y = 2 …) |
| Squares | 11² = 121 to 25² = 625 |
| Cubes | 2³ = 8 to 15³ = 3375 |
| Primes to 100 | 2, 3, 5, 7, 11 … 83, 89, 97 |
| ×2 + 1 series | The gaps double — 4, 9, 19, 39 has gaps 5, 10, 20 |
Turn letters into numbers first. Once a letter series is written as positions, it is just another number series.
The three mistakes that cost the most marks
- Trusting the last two terms. 2, 4, 8 can continue as 16 (×2) or 14 (gaps 2, 4, 6); test the rule on every term.
- Ignoring alternate places. When the series zig-zags, split odd and even places before looking for a rule.
- Counting letters on fingers. One slip in a position value gives exactly the option that is placed next to the answer.
Solved Examples — SSC CGL Series Questions
How the Series Chapter Tests Work
- 25 questions per test, with a full question palette — answered, skipped, marked for review, not visited.
- Every kind of series in every level — number, letter, letter-repeat and alphanumeric questions are mixed in each test, in the same balance as the exam.
- Optional 15-minute timer — with the clock to build exam speed, without it while you are still learning the chapter.
- Marking: +2 correct, −0.5 wrong, 0 unattempted — the same scheme as the real paper.
- Solutions, shortcut tricks and concept notes open after you submit, question by question — every wrong option is explained too.
- English and हिंदी, chosen at the start of every test.
- Free with a TrickySSC account — sign in once with Google or your mobile number, and every test is open to you.
How to Prepare Series for SSC CGL
- Write the gaps under the series. Most number series show their rule in the first or second row of gaps.
- Know squares to 25 and cubes to 15. Gaps such as 25, 36, 49 or 27, 64, 125 should be recognised at a glance.
- Split long or zig-zag series into odd and even places. Two simple runs are easier than one strange one.
- Convert letters to positions. A = 1 to Z = 26, and opposite letters add to 27.
- For blanks, cut the string into blocks. Find the unit length from a complete block, then fill by place.
- Do Level 1 untimed first, then with the 15-minute clock. Move to Level 2 once Level 1 is steady, and then check yourself on a previous year paper.
All SSC CGL Chapter Wise Tests
Every chapter below has its own free Level 1 and Level 2 tests with full solutions.
Browse all 46 chapter tests — Maths (35) · Reasoning (11)
- Word Analogy
- Letter Analogy
- Number Analogy
- Number-Set & Triad Analogy
- Mixed Analogy
- Word Classification
- Letter Classification
- Number Classification
- Number-Pair & Triad Classification
- Word-Pair & Mixed Classification
- Series (Number, Letter & Alphanumeric)
- All Reasoning chapters →
- Number System
- Rule of Divisibility
- Remainder Theorem
- Decimal & Fraction
- LCM & HCF
- Square & Cube Root
- Number Series (AP & GP)
- Power, Indices & Surds
- Algebraic Formula
- Algebraic Result
- Algebraic Expression & Identities
- Percentage
- Profit & Loss
- Discount & Marked Price
- Simple Interest
- Compound Interest
- Ratio & Proportion
- Partnership
- Average
- Problems on Ages
- Mixture & Alligation
- Time & Work
- Pipe and Cistern
- Time, Speed and Distance
- Quadratic Equation
- Boat and Stream
- Races
- Trigonometry
- Heights & Distances
- Geometry
- Mensuration
- Coordinate Geometry
- Probability
- Statistics
- Data Interpretation
- All Maths chapters →
SSC CGL श्रृंखला (Series — Number, Letter & Alphanumeric) चैप्टर टेस्ट — हिंदी में
श्रृंखला (SERIES) में हर पद एक ही नियम से बनता है — संख्या श्रृंखला, अक्षर श्रृंखला, रिक्त स्थान भरने वाली आवर्ती श्रृंखला और अक्षर-संख्या (अल्फान्यूमेरिक) श्रृंखला। पहले अंतर (DIFFERENCE) लिखिए; अंतर न बैठें तो अंतरों के अंतर, अनुपात, वर्ग-घन और विषम-सम स्थान अलग करके देखिए।
सबसे आम गलतियाँ: केवल अंतिम दो पदों से नियम मान लेना, एकांतर (विषम-सम) श्रृंखला को न पहचानना, और अक्षरों के स्थानीय मान (A = 1 … Z = 26) गलत गिनना।
TrickySSC पर इस अध्याय के सभी टेस्ट हिंदी में उपलब्ध हैं — प्रश्न, विकल्प, विस्तृत हल और शॉर्टकट ट्रिक सब हिंदी में। दो स्तर हैं: लेवल 1 (SSC CGL के स्तर का) और लेवल 2 (SSC CGL से कठिन)। प्रत्येक टेस्ट में 25 प्रश्न, वैकल्पिक 15 मिनट का टाइमर और +2 / −0.5 की वही मार्किंग जो असली परीक्षा में होती है।