If the sum of the infinite geometric series $\frac{a}{b}+\frac{a}{b^{2}}+\frac{a}{b^{3}}+\ldots$ is 4, then what is the sum of $\frac{a}{(a+b)}+\frac{a}{(a+b)^{2}} +\frac{a}{(a+b)^{3}}+\ldots ?$

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