If f:R→R satisfies f(x+y) = f(x) + f(y), for all x, y ∈R and f(1) – InterviewSolution

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1.	If f:R→R satisfies f(x+y) = f(x) + f(y), for all x, y ∈R and f(1) = 7, then ∑nr=1 f(r) is equal to
Answer» If $f : R \to R$ satisfies f(x+y) = f(x) + f(y), for all x, y $\in R$ and f(1) = 7, then $\sum_{r = 1}^{n} f (r)$ is equal to

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