Combinations

Combinations(k,n)

"n choose k". The number of unique ways that k items can be chosen from a set of n elements (without replacement and ignoring the order).

Library

Advanced math

Example

Combinations(2,4) → 6

They are: {1,2}, {1,3}, {1,4}, {2,3}, {2,4}, {3,4}

See Also

• Permutations
• Factorial
• LGamma