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The unit vector which is orthogonal to t...

The unit vector which is orthogonal to the vector `3hati+2hatj+6hatk` and is coplanar with the vectors `2hati+2hatj+hatk` and `hati-hatj+hatk` is

A

`(2hati-6hatj+hatk)/sqrt41`

B

`21hatj-7hatk`

C

`(3hatj-hatk)/sqrt10`

D

`(4hati+3hatj-3hatk)/sqrt34`

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