1.

If x=1+a+a^(2)+...oo, a lt 1 and y=1+b+b^(2)+...oo, b lt 1, then 1+ab+a^(2)b^(2)+...oo :

Answer»

`(x+y+XY)/(x+y-1)`
`(x+y)/(x+y-1)`
`(xy)/(x+y-1)`
NONE of these

Solution :N/a


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