Probability & combinations
Calculate combinations and permutations as exact integers, or find the probability of exactly k successes or at least one success in independent trials. Files and entered content are not sent to or stored on a server.
How to use
Calculate combinations and permutations as exact integers, or find the probability of exactly k successes or at least one success in independent trials.
Please note
n from 0–1,000. Trials assume independent outcomes with a constant probability. Extremely small probabilities may display as 0.
Probability & combinations User guide
Instructions
- Choose combinations/permutations or independent-trial probability.
- Enter total n and selected r or exact successes k; for trials add success probability.
- Read exact counts or the probabilities of k successes and at least one success.
Example
Input / settings
n=10, r=3
Result / checks
120 combinations · 720 permutations
Please note
- n from 0–1,000. Trials assume independent outcomes with a constant probability. Extremely small probabilities may display as 0.
- Inputs stay in this browser. Results update immediately and can be copied without creating a file.