If \({a_n} = \sum\limits_{r = 0}^n {\frac{1}{{{n_{{c_r}}}}}}\), then� – McqOptions

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1.	If \({a_n} = \sum\limits_{r = 0}^n {\frac{1}{{{n_{{c_r}}}}}}\), then \(\sum\limits_{r = 0}^n {\frac{r}{{{n_{{c_r}}}}}}\) equals
A.	(n - 1) an
B.	n an
C.	\(\frac{{n\,{a_n}}}{2}\)
D.	None of these
Answer» D. None of these

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