Introduction to 3-D Geometry

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Question

If the points A,B,C,D are collinear and C,D divide AB in the ratios 2:3, -2:3 respectively, then the ratio in which A divides CD is

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Solution

$m : n = 2 : 3,$ A divides $\bar{C D}$ in the ratio $n - m : n + m$

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