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lf `f: R rarr R` satisfies, `f(x + y) = f(x) + f(y), AA x, y in R and f(1) = 4, then sum_(r=1)^n f(r)` is

A

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

B

n(n+1)

C

2n(n+1)

D

4n(n+1)

Text Solution

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The correct Answer is:
C
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