Formula to Calculate Probability
The formula of the probability of an event is:
Probability Formula
Or,
| P(A) = n(E)/n(S) |
Where,
- P(A) is the probability of an event “A”
- n(E) is the number of favourable outcomes
- n(S) is the total number of events in the sample space
Basic Probability Formulas
Let A and B are two events. The probability formulas are listed below:
| All Probability Formulas List in Maths | |
|---|---|
| Probability Range | 0 ≤ P(A) ≤ 1 |
| Rule of Addition | P(A∪B) = P(A) + P(B) – P(A∩B) |
| Rule of 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) |
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