40 If G is the centroid of tr ABC, prove that GA+GB +GC =0. further if G1 be the centroid of the another triangle PQR, show that AP+BQ +CR =3GG1
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![The de Bruijn graph DB(GA, GB, 4) and the condensed de Bruijn graph... | Download Scientific Diagram The de Bruijn graph DB(GA, GB, 4) and the condensed de Bruijn graph... | Download Scientific Diagram](https://www.researchgate.net/publication/270655334/figure/fig10/AS:272660215103510@1442018669754/The-de-Bruijn-graph-DBGA-GB-4-and-the-condensed-de-Bruijn-graph-CDBGA-GB-4-of-two.png)