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PN is an ordinate of the parabola y^2 =...

PN is an ordinate of the parabola `y^2 =9x`. A straight line is drawn through the mid-point M of PN parallel to the axis of the parabola meeting the parabola at Q. NQ meets the tangent at the vertex A, at a point T, then `(AT) /(NP)`equal to
`(a)3/2
(b)4/3
(c)2/3
(d)3/4`

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