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What is the distance of the origin from the plane $2 x+6 y-3 z+7=0 ?
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Required distance $=\frac{|2(0)+6(0)-3(0)+7|}{\sqrt{(2)^{2}+(6)^{2}+(-3)^{2}}}$
$=\frac{|7|}{\sqrt{4+36+9}}=\left|\frac{7}{7}\right|=1$
$=\frac{|7|}{\sqrt{4+36+9}}=\left|\frac{7}{7}\right|=1$
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