[" ILLUSTRATION "2" If "O" and "O'" deno...

[" ILLUSTRATION "2" If "O" and "O'" denote respectively the circum- "],[" centre and orthocentre of "Delta ABC" ,then "vec OA+vec OB+vec OC=],[[" (a) "vec O'O," (b) "vec OO" ,"(c)2vec OO'," (d) "vec 0]]

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