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Probability — Revision Notes

XAT · Quantitative Ability & Data Interpretation

Free Probability revision notes for XAT Quantitative Ability & Data Interpretation 2026 — key concepts, formulas, and definitions for quick revision.

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Revision Notes — Probability

Key concepts, formulas, and definitions from Probability for XAT Quantitative Ability & Data Interpretation preparation.

Key Topics to Revise

1

Basic Concepts and Definitions

  • Probability measures the chance of occurrence of an event on a scale from 0 to 1
  • An event is the outcome we are interested in finding the probability for
  • Sample space contains all possible equally likely outcomes of a random experiment
2

Rules of Probability - AND and OR Operations

  • AND operation corresponds to multiplication of probabilities
  • OR operation corresponds to addition of probabilities
  • Use narrow event definitions to break complex problems into simpler parts
3

Advanced Applications and Special Cases

  • Expectation combines probability with rewards/outcomes
  • Odds express probability as ratios rather than fractions
  • Conditional probability deals with dependent events

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Key Concepts

Probability is the chance or likelihoodAn event is the desired outcomeWhen defining complex eventsA random experiment has known possibleEvents can be classified as

Frequently Asked Questions

What topics are covered in Probability for XAT?
Probability is an important chapter in XAT Quantitative Ability & Data Interpretation. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Basic Concepts and Definitions, Rules of Probability - AND and OR Operations, Advanced Applications and Special Cases.
How important is Probability for XAT?
Probability is a frequently tested chapter in XAT Quantitative Ability & Data Interpretation. Questions from this chapter appear regularly in previous year papers. There are 45 practice questions available for this chapter.
How to prepare Probability for XAT?
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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