C
Combination Calculator
Combinations (nCr)
Number of ways to choose r items from n items (order doesn't matter).
10
C(5, 3) = n! / (r!(n-r)!)
Permutations (nPr)
Number of ways to arrange r items from n items (order matters).
60
P(5, 3) = n! / (n-r)!
Factorial (n!)
Product of all positive integers ≤ n.
5,040
7!