What is Combinatorics Calculator and Why it Matters?
Permutations and combinations count discrete structures in probability, algorithms, and statistical mechanics.
Mathematical Formula and Theory
P(n,r)=n!/(n−r)!, C(n,r)=n!/(r!(n−r)!).
How to Use This Calculator - Step by Step
- Select operation and enter n, r.
- Click Calculate.
Solved Example with Full Calculation
C(10,3)=120, P(10,3)=720, 5!=120.