Prove that
\[
{ }^{n} \mathrm{C}_{r}{ }^{r} \mathrm{C}_{s}={ }^{n} ...
Prove that
\[
{ }^{n} \mathrm{C}_{r}{ }^{r} \mathrm{C}_{s}={ }^{n} \mathrm{C}_{s}{ }^{n-s} \mathrm{C}_{r-s}
\]
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