Probability — Formula Sheet
Telangana Open School (TOSS) · Class 12 · Mathematics
6 formulas from Probability (Telangana Open School (TOSS) Class 12 Mathematics) on one page, grouped by topic.
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Formulas and Key Relations
Probability Basics
P(E) = m/n
P(not E) = 1 - P(E)
Addition Theorem
P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
Classical Definition of Probability
Probability of an event = Number of favorable outcomes / Total number of possible outcomes.
Addition and Multiplication Rules
If A and B are mutually exclusive, P(A ∩ B) = 0, so P(A ∪ B) = P(A) + P(B)
Key relations
If a random experiment has 'n' equally likely, exhaustive, and mutually exclusive outcomes, and 'm' of them are favorable to event A, then P(A) = m/n.
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