UPSC NDA I 2011 Mathematics Paper

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Question : 97 of 120
 
Marks: +1, -0
The points with position vectors 10
∧
i
+3
∧
j
,12
∧
i
−5
∧
j
,a
∧
i
+11
∧
j
are collinear, if the value of a is
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