UPSC NDA I 2013 Mathematics Paper

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Question : 80 of 120
 
Marks: +1, -0
If
→
β
is perpendicular to both
→
α
and
→
γ
where
→
α
=
∧
k
and
→
γ
=2
∧
i
+3
∧
j
+4
∧
k
, then what is
→
β
equal to?
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