engineering recuitment ISRO Scientific Assistant Physics 2020 Mathematics Parabola, Ellipse and Hyperbola Ellipse
If P is a point on the ellipse \(\frac{{{{\rm{x}}^2}}}{9} + \frac{{{{\rm{y}}^2}}}{{16}} = 1\) whose foci are S and S', then PS + PS' is equal to
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