1.

If x = 1+ a + a^(2) + …. infty "," y = 1 + b + b^(2) + …. infty,"" |a| lt 1 , |b| lt 1,then1 + ab + a^(2) b^(2) + ….. infty =

Answer»

xy/x+y
x+y+1/xy
xy/x-y
xy/x+y-1

Answer :D


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