Probability Calculator — Formule
## How to Calculate Probability
### Formula
**P(event) = Favorable Outcomes / Total Outcomes**
Probability ranges from 0 (impossible) to 1 (certain).
### Odds
- **Odds in favor** = favorable / unfavorable
- **Odds against** = unfavorable / favorable
### Formula
**P(event) = Favorable Outcomes / Total Outcomes**
Probability ranges from 0 (impossible) to 1 (certain).
### Odds
- **Odds in favor** = favorable / unfavorable
- **Odds against** = unfavorable / favorable
Exemple Résolu
A bag has 10 marbles: 3 red, 7 blue. What is the probability of drawing a red marble?
- P(red) = 3 / 10 = 0.3
- As a percentage: 30%
- Odds in favor: 3 / 7 ≈ 0.4286
- Odds against: 7 / 3 ≈ 2.3333