KEAM 2014 Math Paper

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Question : 3 of 120
 
Marks: +1, -0
If
⋀
i
+
⋀
j
,
⋀
j
+
⋀
k
,
⋀
i
+
⋀
k
are the position vectors of the vertices of a triangle ABC taken in order, then ∠A is equal to
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