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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)`

A

`(7n(n+1))/2`

B

`(7n)/2`

C

`(7(n+1))/2`

D

`7n(n+1)`

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The correct Answer is:
A
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