42. The distance between the circumcentre and the orthocentre of ΔABC with vertices A(2, 1, 5), B(3, 2, 3), C(4, 0, 4)

$\left(1\right)\sqrt{6}\phantom{\rule{0ex}{0ex}}\left(2\right)\frac{\sqrt{6}}{2}\phantom{\rule{0ex}{0ex}}\left(3\right)2\sqrt{6}\phantom{\rule{0ex}{0ex}}\left(4\right)0$

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