If \[x+y=1\], then \[\sum\limits_{r=0}^{n}{{{r}^{n}}{{C}_{r}}{{x}^{r}}{{y}^{n-r}}}\] equals

If \[x+y=1\], then \[\sum\limits_{r=0}^{n}{{{r}^{n}}{{C}_{r}}{{x}^{r}}

1.	If \[x+y=1\], then \[\sum\limits_{r=0}^{n}{{{r}^{n}}{{C}_{r}}{{x}^{r}}{{y}^{n-r}}}\] equals
A.	1
B.	n
C.	nx
D.	ny
Answer» D. ny

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If \[x+y=1\], then \[\sum\limits_{r=0}^{n}{{{r}^{n}}{{C}_{r}}{{x}^{r}}{{y}^{n-r}}}\] equals

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