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Series — Revision Notes

CAT · Data Interpretation & Logical Reasoning

Free Series revision notes for CAT Data Interpretation & Logical Reasoning 2026 — key concepts, formulas, and definitions for quick revision.

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An infographic illustrating the different types of series discussed in the chapter: Prime Number Series, Difference Series, Product Series, Mixed Series, and Square and Cube Series. Each type should h
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Revision Notes — Series

Key concepts, formulas, and definitions from Series for CAT Data Interpretation & Logical Reasoning preparation.

Key Topics to Revise

1

Prime Number Series

  • Prime numbers have exactly two distinct factors (1 and the number itself)
  • Common prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...
  • Prime differences: Series where consecutive differences follow prime number pattern
2

Difference Series

  • First order difference: Difference between consecutive terms
  • Second order difference: Difference between consecutive first order differences
  • Third order difference: Difference between consecutive second order differences
3

Product Series

  • Each term obtained by multiplying previous term by a constant or variable
  • Constant multiplier: Same number multiplied each time
  • Variable multiplier: Different numbers (often following a pattern) used as multipliers
4

Mixed Series

  • Combination of two or more different series patterns
  • Alternating patterns: Two different rules applied alternately
  • Paired patterns: Groups of terms following different rules

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Key Concepts

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Frequently Asked Questions

What topics are covered in Series for CAT?
Series is an important chapter in CAT Data Interpretation & Logical Reasoning. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Prime Number Series, Difference Series, Product Series, Mixed Series.
How important is Series for CAT?
Series is a frequently tested chapter in CAT Data Interpretation & Logical Reasoning. Questions from this chapter appear regularly in previous year papers. There are 43 practice questions available for this chapter.
How to prepare Series for CAT?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.

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