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If Ai= [ [a^i, b^i] , [b^i, a^i]] and if...

If `A_i= [ [a^i, b^i] , [b^i, a^i]]` and if `|a|<1, |b|<1` then `sum_(i=1)^oo det(A_i) =` (A) `a^2/(1-a)^2- b^2/(1-b)^2` (B) `a^2/(1-a)^2+ b^2/(1-b)^2` (C) `a^2/(1+a)^2- b^2/(1+b)^2` (D) `(a^2-b^2)/[(1-a^2)(1-b^2)]`

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