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  4. A tangent at the point P(20,25) to a parabola intersects its directrix at (-10,9). If the focus of the parabola lies on x-axis, the numbers of such parabolas are

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Q. A tangent at the point $P(20,25)$ to a parabola intersects its directrix at $(-10,9)$. If the focus of the parabola lies on $x$-axis, the numbers of such parabolas are

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Solution:

Correct answer is (a) 1