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Q)

The unit vector perpendicular to each of $2 \hat {i}-\hat {j}+\hat {k}$ and $3 \hat {i}+4 \hat j-\hat k$ is :

$(a)\;\frac{(-3,5,11)}{155} \quad (b)\;\frac{(-3,5,11)}{\sqrt {155}} \quad (c)\;\frac{(3,5,11)}{\sqrt {155}} \quad (d)\;\frac{(3,-5,11)}{\sqrt {155}}$