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[" Let "O" be the origin and let "PQR" be an arbitrary triangle.The point S is such that "],[vec OP.vec OQ+vec OR*vec OS=vec OR*vec OP+vec OQ*vec OS=vec OQ*vec OR+vec OP*vec OS],[" Then the triangle "PQR" has S as its "],[[" (a) "" centroid "," (b) orthocenter "," (c) incentre "," (d) circumcenter "]]

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