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Probability Formula:

Probability Formula




P(A) shows probability of an event.
n(E) shows number of favorable outcomes.
n(S) is the total number of events in the sample space.

Some Basic Probability Formulas

Suppose that the A and B are two events.

Probability Range 0 ≤ P(A) ≤ 1
Addition P(A∪B) = P(A) + P(B) – P(A∩B)
Complementary Events P(A’) + P(A) = 1
Disjoint Events P(A∩B) = 0
Independent Events P(A∩B) = P(A) ⋅ P(B)
Conditional Probability P(A | B) = P(A∩B) / P(B)
Bayes Formula P(A | B) = P(B | A) ⋅ P(A) / P(B)