The distance between the planes given by \[\mathbf{r}.(\mathbf{i}+2\mathbf{j}-2\mathbf{k})+5=0\] and \[\mathbf{r}.(\mathbf{i}+2\mathbf{j}-2\mathbf{k})-8=0\] is

The distance between the planes given by \[\mathbf{r}.(\mathbf{i}+2\ma

1.	The distance between the planes given by \[\mathbf{r}.(\mathbf{i}+2\mathbf{j}-2\mathbf{k})+5=0\] and \[\mathbf{r}.(\mathbf{i}+2\mathbf{j}-2\mathbf{k})-8=0\] is
A.	1 unit
B.	\[\frac{13}{3}\] unit
C.	13 unit
D.	None of these
Answer» C. 13 unit

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The distance between the planes given by \[\mathbf{r}.(\mathbf{i}+2\mathbf{j}-2\mathbf{k})+5=0\] and \[\mathbf{r}.(\mathbf{i}+2\mathbf{j}-2\mathbf{k})-8=0\] is

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