If a_ n = _ r=0 ^ n 1 ^ n C_ r , then equals
Mathematics · JEE Advanced · NTA Exams — Binomial Theorem And Its Simple Applications
If \(a_{n}=\sum_{r=0}^{n} \frac{1}{{ }^{n} C_{r}}\), then
equals
equals- (n – 1) an
- nan

- none of these
Answer
(B) na n
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