Chapter 27 of 27
Formula Sheet
Probability — Formula Sheet
WBJEE · Mathematics
Free Probability formula sheet for WBJEE Mathematics 2026 — all important formulas, equations, and constants for quick reference.
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Important formulas and equations from Probability for WBJEE Mathematics.
Formulas — Probability
Basic Concepts and Sample Space
P(E) = Number of favorable outcomes / Total number of outcomesP(E) = n(E) / n(S)Types of Events
Algebra of Events
P(A') = 1 - P(A)P(A ∪ B) = P(A) + P(B) - P(A ∩ B)P(A ∪ B) = P(A) + P(B)P(A - B) = P(A ∩ B') = P(A) - P(A ∩ B)Addition Theorems
P(A ∪ B ∪ C) = P(A) + P(B) + P(C) - P(A ∩ B) - P(B ∩ C) - P(A ∩ C) + P(A ∩ B ∩ C)P(A ∪ B ∪ C) = P(A) + P(B) + P(C)P(exactly one of A,B,C) = P(A) + P(B) + P(C) - 2P(A∩B) - 2P(B∩C) - 2P(A∩C) + 3P(A∩B∩C)P(exactly two of A,B,C) = P(A∩B) + P(B∩C) + P(A∩C) - 3P(A∩B∩C)P(at least two of A,B,C) = P(A∩B) + P(B∩C) + P(A∩C) - 2P(A∩B∩C)Get the complete formula sheet with derivations — continue in Super Tutor
Frequently Asked Questions
What topics are covered in Probability for WBJEE?
Probability is an important chapter in WBJEE Mathematics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Random Experiments and Sample Space, Types of Events, Axiomatic Definition of Probability, Addition Theorem and Union of Events.
How important is Probability for WBJEE?
Probability is a frequently tested chapter in WBJEE Mathematics. Questions from this chapter appear regularly in previous year papers. There are 233 practice questions available for this chapter.
How to prepare Probability for WBJEE?
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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