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if vec a= 2 hat i+ lambda hat j+ hat k a...

if `vec a= 2 hat i+ lambda hat j+ hat k` and `vec b= hat i+ 2 hat j+ 3 hat k` are orthogonal then the value of `lambda`

A

`(3)/(2)`

B

1

C

`-(5)/(2)`

D

0

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The correct Answer is:
C
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