Question
If ${ }^{13} C_{r}={ }^{13} C_{r+2}$, then find the value of $r$.
Step 1
We know that ${ }^{n} C_{r}={ }^{n} C_{n-r}$, so we can rewrite the given equation as ${ }^{13} C_{r}={ }^{13} C_{13-(r+2)}$. Show more…
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