Probability, Combinatorics & Odds Calculator
Versatile probability and combinatorics calculator. Computes single event probabilities, complementary odds, independent vs. dependent event unions and intersections, conditional probability, permutations nPr = n! / (n - r)!, and combinations nCr = n! / [r!(n - r)!].
Probability & Combinatorics Calculator
Calculate single event probabilities, joint & conditional two-event outcomes, permutations (nPr), and combinations (nCr).
0.076923 as decimal
Favorable : Unfavorable
100% - P(A)
How to Use Probability, Combinatorics & Odds Calculator
Select Calculator Mode
Choose Single Event Odds, Two Events (Union/Intersection), or Combinatorics (nPr / nCr).
Input Favorable Outcomes & Sample Size
Enter event counts or total items (n) and selection count (r).
Read Probability & Odds Formats
Review the result expressed as a percentage, decimal, fractional odds, and step-by-step formula.
Frequently Asked Questions
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