UPSC NDA II 2010 Mathematics Paper

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Question : 69 of 120

Marks: +1, -0

What is the value of b such that the scalar product of the vector

∧

i

+

∧

j

+

∧

k

with the unit vector parallel to the sum of the vectors 2

∧

i

+4

∧

j

−5

∧

k

and b

∧

i

+2

∧

j

+3

∧

k

is unity?

−2
−1
0
1

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