A) \[\mathbf{i}-10\mathbf{j}-18\mathbf{k}\]
B) \[\frac{1}{\sqrt{17}}\,\left( \frac{1}{5}\mathbf{i}-2\mathbf{j}-\frac{18}{5}\mathbf{k} \right)\]
C) \[\frac{1}{\sqrt{473}}\,(7\mathbf{i}-10\mathbf{j}-18\mathbf{k})\]
D) None of these
Correct Answer: B
Solution :
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