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If a, b, c are rational and the tangent ...

If `a, b, c` are rational and the tangent to the parabola `y^2 = 4kx`, at `P(p, q) and Q(q, b)` meet at `R(r, c)`, then the equation `ax^2 + bx-2c=0` has (A) imaginary roots (B) real and equal roots (C) rational roots (D) irrational roots

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