A) \[\pm \frac{1}{3}\]
B) \[\pm \frac{1}{4}\]
C) \[\pm \frac{1}{5}\]
D) \[\pm \frac{1}{6}\]
Correct Answer: A
Solution :
\[|x\mathbf{a}|=|x||\mathbf{a}|\Rightarrow |x|\sqrt{4+4+1}=1\]\[\Rightarrow x=\pm \frac{1}{3}.\]
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