UPSC NDA I 2012 Mathematics Paper

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Question : 99 of 120

Marks: +1, -0

If the vectors

∧

i

−x

∧

j

−y

∧

k

and

∧

i

+x

∧

j

−y

∧

k

are orthogonal to each other, then what is the locus of the point (x,y) ?

a parabola
an ellipse
a circle
a straight line

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