Question: If $a_n = \sum_{r=0}^{n} \frac{1}{{^nC_r}}$, then $\sum_{r=0}^{n} \frac{r^2}{{^nC_r}}$ = P(n) a\...

Question

If $a_n = \sum_{r=0}^{n} \frac{1}{{^nC_r}}$ , then $\sum_{r=0}^{n} \frac{r^2}{{^nC_r}}$ = P(n) a $_{n+2}$ + Q(n) a $_{n+1}$ + a $_{n}$ + R(n), where P(n), Q(n), R(n) are the polynomial functions of n, then

P(5) =

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Question: If \(a_n = \sum_{r=0}^{n} \frac{1}{{^nC_r}}\), then \(\sum_{r=0}^{n} \frac{r^2}{{^nC_r}}\) = P(n) a\...

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