add articles/combinations-and-permutations.md

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diff --git a/static/files/articles/combinations-and-permutations/formulas.tex b/static/files/articles/combinations-and-permutations/formulas.tex
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+\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}