The unit vector perpendicular to each of the vectors.
(3i ̂+j ̂+2k ̂ ) and (2i ̂-2j ̂+k ̂ ) is given by
a) 1/√3 (i ̂-j ̂-k ̂ ) b) 1/√3 (i ̂+j ̂+k ̂ )
c) 1/√3 (-i ̂-j ̂-k ̂ ) d) 1/(3√10) (5i ̂+j ̂-8k ̂ )
[RPMT -2014]
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