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Question

If O, A, B, C and D are five points, such that 3OD+DA+DB+DC=k(OA+OB+OC) then k = ________________.

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Solution

Given: 3OD+DA+DB+DC=k(OA+OB+OC)


3OD+DA+DB+DC=kOA+OB+OCOD+DA+OD+DB+OD+DC=kOA+OB+OCOD+DA+OD+DB+OD+DC=kOA+OB+OCOA+OB+OC=kOA+OB+OCOA+OB+OC=kOA+OB+OC1=k


Hence, k = 1.

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