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UPSC NDA I 2019 Mathematics Solved Paper

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Question : 100 of 120
 
Marks: +1, -0
What is the value of λ for which the vectors 3
^
i
 + 4
^
j
 -
^
k
 and −2
^
i
 + λ
^
j
+10
^
k
 are perpendicular?
[NDA I 2019]
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