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1+(1+a)x+(1+a+a^2)x^2+..........0lta,xlt...

`1+(1+a)x+(1+a+a^2)x^2`+..........`0lta,xlt1` equals (1)`1/((1-x)(1-a))` (2)`1/((1-a)(1-ax))` (3)`1/((1-x)(1-ax)` (4)`1/((1-x)(1+a))`

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