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About This Tool
The Probability Calculator handles three essential calculations: basic probability (favorable outcomes / total outcomes), permutations (nPr — ordered arrangements), and combinations (nCr — unordered selections).
Probability and combinatorics are fundamental to statistics, data science, gaming, risk assessment, and countless real-world decisions. Whether you are calculating lottery odds, card game probabilities, or experiment outcomes, this tool gives you instant, accurate results.
Select a calculation mode, enter your values, and see the result along with the formula used. The calculator handles large numbers and shows simplified fractions where appropriate.