# Estimate Probability

## Single Probability Calculator

Formulas:

- Probability of event A occurring P(A) = n(A) / n(S).
- Probability of event A not occurring P(A') = 1 - P(A).

### Example Multiple Probability Calculation

Find multiple event probabilitiy, given n(s) = 50, n(A) = 10 and n(B) = 5

P(A) = 10/50 = 0.2

P(A') = 1-0.2 = 0.8

P(B) = 5/50 = 0.1

P(B') = 1-0.1 = 0.9

P(A ∩ B) = 0.2 *0.1 = 0.02

P(A ∪ B) = ( 0.2 + 0.1 ) - 0.02 = 0.28

P(A | B) = 0.02 / 0.1 = 0.2