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[" 5.If "f:R rarr R" satisfies "f(x+y)=f...

[" 5.If "f:R rarr 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(x)],[[" (A) "(7n)/(2)," (B) "(7(n+1))/(2)," (C) "7n(n+1)]]

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