Distance between two parallel planes $2 \mathrm{x}+\mathrm{y}+2 \mathrm{z}=8$ and $4 \mathrm{x}+2 \mathrm{y}+4 \mathrm{z}+5=0$ is :-
$\frac{3}{2}$
$\frac{5}{2}$
$\frac{7}{2}$
$\frac{9}{2}$
Correct Option: , 3
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