Let \(S\) be the sum, \(P\) be the product and \(R\) be the sum of the reciprocals of 3 terms of a G.P.Then find \( \frac{P^2 \times R^3}{S^3}=\dfrac{a}{b}\), where \(a\) and \(b\) are coprime, find \(|a+b|\) .

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