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If x = 1+a+a^2+..........oo where abs(a)...

If `x = 1+a+a^2+..........oo` where `abs(a)lt1` and `y=1+b+b^2+........oo`where `abs(b)lt1`
.Prove that `1+ab+a^2b^2+.......oo = (xy)/(x+y-1)`

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