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Let f(n)=Sigma(r=1)^(10n)(6+rd) and g(n)...

Let `f(n)=Sigma_(r=1)^(10n)(6+rd) and g(n)=Sigma_(r=1)^(n)(6+rd)`, where `n in N, d ne 0.` If `(f(n))/(g(n))` is independent of n, then d is equal to

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