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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

B

j

C

k

D

`(i+j+k)/sqrt3`

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The correct Answer is:
C
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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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