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The vector (s) which is (are) coplanar w...

The vector (s) which is (are) coplanar with vectors `hati+hatj+2hatk` and `hati+2hatj+hatk`, and perpendicular to the vector `hati+hatj+hatk`, is/are

A

`-hatj+hatk`

B

`hati-hatk`

C

`hati-hatj`

D

`hati-2hatj+hatk`

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The correct Answer is:
A
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