Probability Calculator
Calculate combinations, permutations, binomial probability, and basic probability
Probability Concepts
Basic Probability
Probability = Favorable Outcomes ÷ Total Possible Outcomes
Always between 0 (impossible) and 1 (certain)
Combinations vs Permutations
- Combinations C(n,r): Order doesn't matter (selecting items)
- Permutations P(n,r): Order matters (arranging items)
Binomial Distribution
Probability of exactly k successes in n independent trials, each with probability p of success.