1.

The vector equation of a plane, which is at a distance of 8 unit from the origin and which is normal to the vector \[2\mathbf{i}+\mathbf{j}+2\mathbf{k},\] is

A.            \[\mathbf{r}.(2\mathbf{i}+\mathbf{j}+\mathbf{k})=24\]
B.            \[\mathbf{r}.(2\mathbf{i}+\mathbf{j}+2\mathbf{k})=24\]
C.            \[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=24\]
D.            None of these
Answer» C.            \[\mathbf{r}.(\mathbf{i}+\mathbf{j}+\mathbf{k})=24\]


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