If \[\sum\limits_{r=0}^{n}{\frac{r+2}{r+1}{{\,}^{n}}{{C}_{r}}=\frac{{{2}^{8}}-1}{6}}\], then n is

If \[\sum\limits_{r=0}^{n}{\frac{r+2}{r+1}{{\,}^{n}}{{C}_{r}}=\frac{{{

1.	If \[\sum\limits_{r=0}^{n}{\frac{r+2}{r+1}{{\,}^{n}}{{C}_{r}}=\frac{{{2}^{8}}-1}{6}}\], then n is
A.	8
B.	4
C.	6
D.	5
Answer» E.

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If \[\sum\limits_{r=0}^{n}{\frac{r+2}{r+1}{{\,}^{n}}{{C}_{r}}=\frac{{{2}^{8}}-1}{6}}\], then n is

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