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

If `vec a = -i +j +k, vec b = i-j+k`, then a unit vector perpendicular to `vec a` and `vec b` is

A

k

B

`1/sqrt2 (i+j)`

C

`1/sqrt (j+k)`

D

`1/sqrt 2(i-j)`

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The correct Answer is:
B
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