## Probability Formula:

Or

$$\text{P(A)}\;=\;\frac{\text{n(E)}}{\text{n(S)}}$$

Where,

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)