Test

Testtesttesttest

\(\frac{n!}{k!(n-k)!}\)

\[ A\ =\ \left( \begin{array}{c|ccc} & 1 & 2 & 3 \\ \hline 1&a_{11}&a_{12}&a_{13} \\ 2&a_{21}&a_{22}&a_{23} \\ 3&a_{31}&a_{32}&a_{33} \end{array} \right)\]

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