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Let f:R rarr R be a function which sati...

Let `f:R rarr R ` be a function which satisfies `f(x+y)=f(x)+f(y) AA x, y in R`. If `f(1)=2` and `g(n)=sum_(k-1)^((n-1))f(k),n in N` then the value of n , for which `g(n)=20`, is :

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