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The integral value of m for which the ro...

The integral value of `m` for which the root of the equation `m x^2+(2m-1)x+(m-2)=0` are rational are given by the expression [where `n` is integer]
(A)`n^2`
(B) `n(n+2)`
(C) `n(n+1)`
(D) none of these

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