NDA Math Vector Algebra

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Question : 91 of 101
 
Marks: +1, -0
Which one of the following is the unit vector perpendicular to both
→
a
=−
∧
i
+
∧
j
+
∧
k
and
→
b
=
∧
i
−
∧
j
+
∧
k
[NDA II 2014]
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