Let origin O be the orthocentre of an equilateral triangle ABC. If − – InterviewSolution

1.	Let origin O be the orthocentre of an equilateral triangle ABC. If −−→OA=→a,−−→OB=→b,−−→OC=→c, then −−→AB+2−−→BC+3−−→CA=
Answer» Let origin $O$ be the orthocentre of an equilateral triangle $A B C$ . If $- - \to O A = \to a, - - \to O B = \to b, - - \to O C = \to c,$ then $- - \to A B + 2 - - \to B C + 3 - - \to C A =$

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