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COnsider the sequence (an)n >= 1, such t...

COnsider the sequence `(a_n)n >= 1,` such that `sum_(k=1)^n a_k=(3n^2+9n)/2 AA n >= 1.` If `lim_(n->oo) 1/(na_n) sum_(k=1)^n a_k = p/q` (where `p and q` are coprime), then `(p+q)` is equal to

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