Probability Calculator

Probability Calculator is a simple offline tool for learning and working with probability and combinatorics. It provides clean inputs, formula hints, short step-by-step explanations, and results shown as decimals and percentages. Features • Combinatorics: combinations C(n,k), permutations n!, variations without repetition V(n,k), and variations with repetition n^k • Simple probability: classical probability, complement, union via inclusion-exclusion, and independent intersection • Binomial distribution: P(X = k), P(X ≤ k), P(X ≥ k), and range probability P(a ≤ X ≤ b) • PMF bar preview and value list • Recent calculation history • Copy results and reopen previous scenarios • Quick examples and shortcuts on the home screen • Light, dark, and system theme • Decimal precision and result format settings • Optional percent, formula, and step display • Auto-save history Everything works offline on your device. No account is required and no internet connection is needed for calculations. Probability Calculator is designed for study, practice, and quick reference in everyday use. Note: This app is intended for education and reference. Double-check important results independently and follow your school or workplace requirements where needed.