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Find a unit vector perpendicular to each of the vectors `( veca + vecb) and ( veca- vecb)` where ` veca = hati + hatj + hatk , vecb = hati + 2 hatj + 3hatk `

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The correct Answer is:
`= ( -hat(i) + 2 hat(j) + hat(k) )/( sqrt6)`
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