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UPSC NDA I 2017 Mathematics Solved Paper

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Question : 100 of 120
 
Marks: +1, -0
If
→
a
=2
⋀
i
+3
⋀
j
+4
⋀
k
 and
→
b
=3
⋀
i
+2
⋀
j
−λ
⋀
k
 are perpendicular, then what is the value of 𝜆?
[NDA I 2017]
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