If \( a_{n}=\sum_{r=0}^{n} \frac{1}{{ }^{n} C_{r}} \), then value of \( \sum_{r=0}^{n} \frac{n-2....
If \( a_{n}=\sum_{r=0}^{n} \frac{1}{{ }^{n} C_{r}} \), then value of \( \sum_{r=0}^{n} \frac{n-2 r}{{ }^{n} C_{r}} \) is
\( \mathrm{P} \)
(1) \( \frac{n}{2} a_{n} \)
(2) \( \frac{1}{4} a_{n} \)
(3) \( n a_{n} \)
(4) 0
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