If \( d \) is the distance between the planes given by \[ \vec{r} \cdot(\hat{i}+2 \hat{j}-2 \hat...
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0If \( d \) is the distance between the planes given by
\[
\vec{r} \cdot(\hat{i}+2 \hat{j}-2 \hat{k})+5=0 \text { and } \vec{r} \cdot(\hat{i}+2 \hat{j}-2 \hat{k})-8=0 \text {, }
\]
then \( 3 d= \)
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