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UPSC NDA I 2023 Mathematics Solved Paper

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Consider the following for the next two (02) items that follow :
Let

→

a

=3

^

i

+3

^

j

+3

^

k

and

→

c

=

^

j

−

^

k

. Let

→

b

be such that

→

a

⋅

→

b

=27 and

→

a

×

→

b

=

→

9c

[NDA I 2023]

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Question : 66 of 120

Marks: +1, -0

What is the angle between (

‌
π
2
‌
π
3
‌
π
4
‌
π
6

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