\[\sum\limits_{r=0}^{m}{^{n+r}{{C}_{n}}=}\] [Pb. CET 2003]

1.	\[\sum\limits_{r=0}^{m}{^{n+r}{{C}_{n}}=}\] [Pb. CET 2003]
A.	\[^{n+m+1}{{C}_{n+1}}\]
B.	\[^{n+m+2}{{C}_{n}}\]
C.	\[^{n+m+3}{{C}_{n-1}}\]
D.	None of these
Answer» B. \[^{n+m+2}{{C}_{n}}\]

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\[\sum\limits_{r=0}^{m}{^{n+r}{{C}_{n}}=}\] [Pb. CET 2003]

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