The vector equation of the plane containing the lines \[\mathbf{r}=(\mathbf{i}+\mathbf{j})+\lambda (\mathbf{i}+2\mathbf{j}-\mathbf{k})\] and \[\mathbf{r}=(\mathbf{i}+\mathbf{j})+\mu (-\mathbf{i}+\mathbf{j}-2\mathbf{k})\] is

\[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=3\]

\[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=0\]

\[\mathbf{r}.(\mathbf{i}-\mathbf{j}-\mathbf{k})=0\]

The vector equation of the plane containing the lines \[\mathbf{r}=(\m

1.	The vector equation of the plane containing the lines \[\mathbf{r}=(\mathbf{i}+\mathbf{j})+\lambda (\mathbf{i}+2\mathbf{j}-\mathbf{k})\] and \[\mathbf{r}=(\mathbf{i}+\mathbf{j})+\mu (-\mathbf{i}+\mathbf{j}-2\mathbf{k})\] is
A.	\[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=0\]
B.	\[\mathbf{r}.(\mathbf{i}-\mathbf{j}-\mathbf{k})=0\]
C.	\[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=3\]
D.	None of these
Answer» C. \[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=3\]

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The vector equation of the plane containing the lines \[\mathbf{r}=(\mathbf{i}+\mathbf{j})+\lambda (\mathbf{i}+2\mathbf{j}-\mathbf{k})\] and \[\mathbf{r}=(\mathbf{i}+\mathbf{j})+\mu (-\mathbf{i}+\mathbf{j}-2\mathbf{k})\] is

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