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

Given `vec a = i+j-k, vec b = -i+2j+k` and `vec c = -i+2j-k`, a unit vector perpendicular to both `vec a + vec b` and `vec b + vec c` is

A

i-j+k

B

j

C

k

D

none of these

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A
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