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The vectors which is/are coplanar with v...

The vectors 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+hatj` (C) `hati-hatj` (D) `-hatj+hatk`

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The correct Answer is:
`2hati - hatj, (11hatj -2hati)/5`
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