Identity of symmetry

The identity of symmetry is: $(\begin{matrix} m \\ n \end{matrix}) = (\begin{matrix} m \\ m - n \end{matrix})$

Example

For example:

$(\begin{matrix} 5 \\ 2 \end{matrix}) = (\begin{matrix} 5 \\ 5 - 2 \end{matrix}) = (\begin{matrix} 5 \\ 3 \end{matrix})$

$(\begin{matrix} 7 \\ 2 \end{matrix}) = (\begin{matrix} 7 \\ 5 \end{matrix})$

$(\begin{matrix} 100 \\ 99 \end{matrix}) = (\begin{matrix} 100 \\ 1 \end{matrix}) = 100$