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Let tr denote the r^(th) term of an A.P...

Let `t_r` denote the `r^(th)` term of an A.P. Also suppose `t_m=1/n` and `t_n=1/m` for some positive integers `m` and `n` then which of the following is necessarily a root of the equation? `(l+m-2n)x^2+(m+n-2l)x+(n+l-2m)=0`

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