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Let \mathrmP\left(\dfrac2√3√7, \dfrac6√7\right), \mathrmQ, \mathrmR and \mathrmS be four points on the ellipse 9x^2+4y^2=36. Let \mathrmPQ and \mathrmRS be mutually perpendicular and pass through the origin. If \dfrac1(PQ)^2+\dfrac1(RS)^2=\dfracpq, where p and q are coprime, then p+q is equal to: | Watch the step-by-step video solution for this NIMCET PYQ.