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For each positive integer $n$, the parabola $y=(n^{2}+n)x^{2}-(2n+1)x+1$ cuts the x axis at the points $A_{n}$ and $B_{n}$.What is the value of $\displaystyle \sum_{n=1}^{1992}A_{n}B_{n}$

This problem is a part of my set Some JEE problems

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