Consider the points \( \mathrm{P}(2,-4) \); \( \mathrm{Q}(4,-2) \) ...

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Consider the points \( \mathrm{P}(2,-4) \); \( \mathrm{Q}(4,-2) \) and \( \mathrm{R}=(7,1) \). The points \( \mathrm{P}, \mathrm{Q}, \mathrm{R} \)
(A) form an equilateral triangle
D.
(B) form a right angled triangle
(C) form an isosceles triangle which is not equilateral
(D) are collinear.
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