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Q.) If x and y are two non-collinear vectors and ABC is a triangle with side lengths a, b and c satisfying (20a - 15b)x + (15b - 12c)y + (12c - 20a)(x × y) = 0, then triangle ABC is

[A]an acute-angled triangle

[B]an obtuse-angled triangle

[C]a right-angled triangle

[D]an isosceles triangle

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