if f: 9R to 9R satisfies f(x+y)=f(x)+f(y...

if `f: 9R to 9R` satisfies `f(x+y)=f(x)+f(y)`, for all `x, y , in 9 R and f(1)=10` then `sum_(r=1)^(n) f(r)`

A

5n

B

5(n+1)

C

10n (n+1)

D

5n(n+1)

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