🎲
Permutation/Combination Calculator
Calculate permutations (P), combinations (C), and factorials (!)
nCr = n!/(r!(n-r)!)
📖 How to Use
- Select calculation type
- Enter n and r
- Check result and solution
✨ Features
- ✓Permutation/Combination/Factorial
- ✓Step-by-step solution
- ✓Pascal's triangle
📐 Formula
P(n,r) = n!/(n-r)!, C(n,r) = n!/r!(n-r)!💡 How It Works
- •Factorial (n!): n × (n-1) × ... × 2 × 1. Example: 5! = 120
- •Permutation: Order matters. Number of ways to arrange r items from n items.
- •Combination: Order doesn't matter. Number of ways to choose r items from n items.
- •Relationship: P(n,r) = C(n,r) × r!
- •Combination property: C(n,r) = C(n, n-r). Example: 10C3 = 10C7
❓ FAQ
Q. What is 10C3?
A. 120 (10!/(3!×7!) = 120)
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