If a_ n = _ r=0 ^ n 1 ^ n C_ r , then equals

Mathematics · JEE Advanced · NTA ExamsBinomial Theorem And Its Simple Applications

If \(a_{n}=\sum_{r=0}^{n} \frac{1}{{ }^{n} C_{r}}\), then equals
  1. (n – 1) an
  2. nan
  3. none of these

Answer

(B) na n

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