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Let a+ar1+ar1^2+……+ oo and a+ ar2+ar2^2...

Let `a+ar_1+ar_1^2+……+ oo and a+ ar_2+ar_2^2 +…+oo` be two infinite series of positive numbers with the same first term. The sum of the firest series is `r_1` and the value of the second series is `r_2` . Then the value of `(r_1+R_2)` is _________.

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