$$\begin{pmatrix}n\\k\end{pmatrix}=\frac{n!}{k!(n-k)!}=\frac{n\cdot(n-1)\cdot\ldots\cdot(n-k+1)}{k!}$$
\( E=mc^2 \)\( E=mc^2 \)
$$ i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right>=H\left|\Psi(t)\right> $$
\[ i\hbar\frac{\partial}{\partial t}\left|\Psi(t)\right>=H\left|\Psi(t)\right> \]
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