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[" Let "ABC" be a triangle whose circumc...

[" Let "ABC" be a triangle whose circumcentre is at "P." If the position vectors of "A,B,C" and "P" are "vec a,vec b,vec c],[" and "(vec a+vec b+vec c)/(4)" respectively,then the position vector of the orthocenter of this triangle,is "],[[" (a) "-((vec a+vec b+vec c)/(2))," (b) "vec a+vec b+vec c," (c) "((vec a+vec b+vec c)/(2))," (d) "vec 0]]

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