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

The vector(s) which is/are coplanar with vectors ` hat i+ hat j+2 hat ka n d hat i+2 hat j+ hat k ,` and perpendicular to vector ` hat i+ hat j+ hat k ,` is/are a.` hat j- hat k` b. `- hat i+ hat j` c. ` hat i- hat j` d. `- hat j+ hat k`

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