Infinite Geometric Series

Algebra Level 3

ab+ab2+ab3+=4 \frac{a}{b}+\frac{a}{b^{2}}+\frac{a}{b^{3}}+\ldots = 4

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

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