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Stationary Point

If the H.M of...

Question

If the H.M ofxandyis 2 then show that the points A (x, 2x), B(2y,y) and C(3, 3) are collinear.
What is H.M here ?

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Solution

$Here H . M means harmonic means . S s 2 = \frac{2 x y}{x + y}$

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