(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

So we're suppose to show that the intervals connecting vertices of a tetrahedron with centers of gravity of opposite sides interesect at one point, namely the center of gravity of a normal tetrahedron. The center of gravity is (P+Q+R+S)/4.

2. Relevant equations

All I know is we have to somehow work with vectors so we at the end, we end up with result.

I really have no idea how to start. Please help :(

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# Calculus 3 question

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