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

[" 22.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(r)" is "]

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