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\[ \frac{a}{b}+\frac{a}{b^{2}}+\frac{a}{b^{3}}+\ldots = 4\]

\[ \frac{a}{a+b}+\frac{a}{(a+b)^{2}}+\frac{a}{(a+b)^{3}}+\ldots = \ ? \]

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