The distance of the origin from the centroid of the triangle whose two sides have the equations ...

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The distance of the origin from the centroid of the triangle whose two sides have the equations \( x-2 y+1=0 \) and \( 2 x-y-1=0 \) and whose orthocenter is \( \left(\frac{7}{3}, \frac{7}{3}\right) \)
(a) \( \sqrt{2} \)
(b) 2
(c) \( 2 \sqrt{2} \)
(d) 4
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