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Let vec a = i+2j+k, vec b = i-j+k, vec c...

Let `vec a = i+2j+k, vec b = i-j+k, vec c = i+j-k`. A vector coplanar to a `vec a` and `vec b` has a projection along `vec c` of magnitude `1/sqrt3`, then the vector is

A

4i-j+4k

B

4i+j-4k

C

2i+j+k

D

none of these

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The correct Answer is:
A
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