KEAM 2021 Math Solved Paper

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Question : 27 of 120

Marks: +1, -0

If |

→

a

|=2,

→

b

=2

^

i

−

^

j

−3

^

k

and the angle between

→

a

and

→

b

is

π

4

, then

→

a

.

→

b

is equal to

14√2
2√7
√30
√7
√14

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