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UPSC NDA I 2014 Mathematics Paper

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For the next two (02) items that follow:
Consider the vectors

→

a

=

∧

i

−2

∧

j

+

∧

k

and

→

b

=4

∧

i

−4

∧

j

+7

∧

k

[NDA I 2014]

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Question : 70

Total: 120

What is the vector perpendicular to both the vectors?

−10
∧
i
−3
∧
j
+4
∧
k
−10
∧
i
+3
∧
j
+4
∧
k
10
∧
i
−3
∧
j
+4
∧
k
None of the above

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