The distance of the point \[2\mathbf{i}+\mathbf{j}-\mathbf{k}\] from the plane \[\mathbf{r}.(\mathbf{i}-2\mathbf{j}+4\mathbf{k})=9\] is

The distance of the point \[2\mathbf{i}+\mathbf{j}-\mathbf{k}\] from t

1.	The distance of the point \[2\mathbf{i}+\mathbf{j}-\mathbf{k}\] from the plane \[\mathbf{r}.(\mathbf{i}-2\mathbf{j}+4\mathbf{k})=9\] is
A.	\[\frac{13}{\sqrt{21}}\]
B.	\[\frac{13}{21}\]
C.	\[\frac{13}{3\sqrt{21}}\]
Answer» B. \[\frac{13}{21}\]

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The distance of the point \[2\mathbf{i}+\mathbf{j}-\mathbf{k}\] from the plane \[\mathbf{r}.(\mathbf{i}-2\mathbf{j}+4\mathbf{k})=9\] is

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