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A(3xx3) is a matrix such that |A|-a,R=(...

`A_(3xx3)` is a matrix such that `|A|-a,R=(adj A)` such that `|B|=b.` Find the value of `(ab^2+a^2b+1)S` where `1/2 S= a/b+a^2/b^2+a^3/b^3+........`up to `oo_1 and a=3.`

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