If \[f:R\to R\] satisfies \[f(x+y)=f(x)+f(y)\], for all \[x,\ y\in R\] – McqOptions

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1.	If \[f:R\to R\] satisfies \[f(x+y)=f(x)+f(y)\], for all \[x,\ y\in R\] and \[f(1)=7\], then \[\sum\limits_{r=1}^{n}{f(r)}\] is [AIEEE 2003]
A.	\[\frac{7n}{2}\]
B.	\[\frac{7(n+1)}{2}\]
C.	\[7n(n+1)\]
D.	\[\frac{7n(n+1)}{2}\]
Answer» E.

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