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The points (a , b),(c , d), and ((k c+l ...

The points `(a , b),(c , d),` and `((k c+l a)/(k+l),(k d+l b)/(k+l))` are (a) vertices of an equilateral triangle (b) vertices of an isosceles triangle (c) vertices of a right-angled triangle (d) collinear

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