The vector(s) which is/are coplanar with vectors i + j + 2 k and i + 2 j + k, and perpendicular to the vector i + j + k is/are

JEE Advanced 2011 Mathematics question

The vector(s) which is/are coplanar with vectors and , and perpendicular to the vector is/are

Answer: (A),(D)

Any vector coplanar with the two given vectors is . Perpendicular to : $(α + β) + (α + 2β) + (2α + β) =

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Question ID VK-025928