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UPSC NDA I 2012 Mathematics Paper

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Question : 95

Total: 120

Let O be the origin and P,Q,R be the points such that

. Then which one of the following is correct?

P,Q,R are the vertices of an equilateral triangle
P,Q,R are the vertices of an isosceles triangle
P,Q,R are collinear
None of the above

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