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If vec a = 2i+j+k, vec b = i + 2j-k and ...

If `vec a = 2i+j+k, vec b = i + 2j-k` and a unit vector `vec c` be coplanar. If `vec c` is perpendicular to a `vec a` then `vec c =`

A

`1/sqrt2 (-j+k)`

B

`1/sqrt3(-i-j-k)`

C

`1/sqrt5(i-2j)`

D

`1/sqrt3 (i-j+k)`

Text Solution

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The correct Answer is:
A
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