Prove that
\( \mathrm{P} \)
\[
{ }^{n} C_{r}+{ }^{n-1} C_{r}+{ }^{n...
Prove that
\( \mathrm{P} \)
\[
{ }^{n} C_{r}+{ }^{n-1} C_{r}+{ }^{n-2} C_{r}+
\]
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