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Sum of the first n terms of an A.P. havi...

Sum of the first n terms of an A.P. having positive terms is given by `S_n=(1+2T_n)(1-T_n) (where T_n` is the nth term of the series). The value of `T_2^2` is (A) `(sqrt(2)+1)/(2sqrt(2))` (B) `(sqrt(2)-1)/(2sqrt(2))` (C) `1/(2sqrt(2))` (D) none of these

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