Prelims CSAT (Paper II)Logical Reasoning & Analytical Ability
Coding-Decoding & Series
कोडिंग-डिकोडिंग और श्रृंखला
Coding-Decoding & Series is part of the UPSC Prelims CSAT (Paper II) syllabus, under Logical Reasoning & Analytical Ability. It appeared in Prelims CSAT (Paper II) question papers in 2 of the 10 years from 2016 to 2025 (2019, 2022).
What should you study in Coding-Decoding & Series?
- Number series — arithmetic, geometric, mixed
- Letter series & alphabet series
- Missing number in matrix/table
- Verbal classification & odd one out
How often is Coding-Decoding & Series asked in UPSC Prelims?
Asked in 2 of 10 years, including 1 of the last 5. Highlighted years below are the ones it appeared in.
- 2016: not asked
- 2017: not asked
- 2018: not asked
- 2019: asked
- 2020: not asked
- 2021: not asked
- 2022: asked
- 2023: not asked
- 2024: not asked
- 2025: not asked
About the Prelims CSAT (Paper II) paper
CSAT is Prelims Paper II: 80 multiple-choice questions for 200 marks. It is qualifying — you need 33% to pass, and the marks do not count towards the cut-off. See all 24 Prelims CSAT (Paper II) topics.
Related topics to study next
- Logical Deduction & SyllogismsHigh-yieldasked 5/10 yrs
- Analytical ReasoningHigh-yieldasked 4/10 yrs
- Data SufficiencyHigh-yieldasked 5/10 yrs
- Blood Relations & Directionsasked 2/10 yrs
- Statement & ConclusionsHigh-yieldasked 3/10 yrs
- Number Systems & DivisibilityHigh-yieldasked 5/10 yrs
- Ratio, Proportion & PercentageHigh-yieldasked 5/10 yrs
- Bar Charts AnalysisHigh-yieldasked 5/10 yrs
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