The unit vector perpendicular to the plane passing
P through point ...
The unit vector perpendicular to the plane passing
P through point \( P(\hat{i}-\hat{j}+2 \hat{k}), \quad Q(2 \hat{i}-\hat{k}) \) and
W \( R(2 \hat{j}+\hat{k}) \) is
(1) \( \frac{1}{\sqrt{6}}(2 \hat{i}+\hat{j}+\hat{k}) \)
(2) \( \frac{1}{6}(2 \hat{i}+\hat{j}+\hat{k}) \)
(3) \( \sqrt{6}(2 \hat{i}+\hat{j}+\hat{k}) \)
(4) \( 2 \hat{i}+\hat{j}+\hat{k} \)
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