Skip to main content
Super TutorResources
Chapter 14 of 14
Revision Notes

Probability — Revision Notes

CBSE · Class 11 · Mathematics

Probability revision notes for CBSE Class 11 Mathematics: 4 topics in quick points. Part of the CBSE Class 11 Mathematics syllabus.

157 questions68 flashcards12 formulas & key relations5 concepts

Interactive on Super Tutor

Studying Probability? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for revision notes and more.

Try Super Tutor — Free

Free trial, no card needed.

Key Topics to Revise

1

1. Events and Sample Space

  • The sample space serves as a universal set for all questions concerned with the experiment.
  • An event E is said to have occurred if the outcome ω of the experiment satisfies ω ∈ E.
  • Any subset E of a sample space S is called an event.
2

2. Algebra of Events

  • The complementary event A' is the event 'not A'.
  • The complementary event A' equals S - A.
  • The event 'A or B' is defined as the union A ∪ B.
3

3. Axiomatic Approach to Probability

  • The probability P is a real-valued function whose domain is the power set of S and range is [0,1].
  • For any event E, P(E) ≥ 0.
  • P(S) = 1.
4

4. Probability of Equally Likely Outcomes

  • For equally likely outcomes, P(ωi) = 1/n where n is the number of sample points.
  • If n(S) = n and n(E) = m, then P(E) = m/n.
  • Probability of an event is the number of favourable outcomes divided by the total number of outcomes, when all outcomes are equally likely.

Get complete notes with diagrams and examples

Full Notes

Key Concepts

Any subset E of a sampleThe empty set φ isThe whole sample space SIf an event has exactly oneIf an event has more than

Frequently Asked Questions

What are the important topics in Probability for CBSE Class 11 Mathematics?
Key topics in Probability include Events and Sample Space, Algebra of Events, Axiomatic Approach to Probability, Probability of Equally Likely Outcomes. Study these first, then practise questions on each for Class 11 exams.
How should I revise Probability for Class 11 exams?
Learn the core ideas first, then work through the 157 practice questions on Probability. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Probability

All CBSE Class 11 Mathematics Revision Notes

For serious students

Get the full Probability chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for CBSE Class 11 Mathematics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free