\begin{array}{|l|c|c|c|} \hline \text{Name} & \text{Ordered} & \text{With Repetition} & \text{Without Repetition} \\ \hline \text{Permutation} & \text{Yes} & n^k & \frac{n!}{(n - k)!} \\ \hline \text{Combination} & \text{No} & {n + k - 1 \choose k} & {n \choose k} \\ \hline \end{array}