Question:
The vector equation of the $x$-axis is given by
A. $\overrightarrow{\mathrm{r}}=\hat{\mathrm{i}}$
B. $\vec{r}=\hat{j}+\hat{k}$
C. $\overrightarrow{\mathrm{r}}=\lambda \hat{\mathrm{i}}$
D. none of these
Solution:
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