UNsolved problem 141134 added to Vectors

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UNsolved problem 141134 added to Vectors

May 12th, 2008

Click on the link to solve this problem: The position vector of the points A,B,C are i+j+k,i+5j-k and 2i+3j+5k, respectively.The greatest angle of the triangle ABC is (a) 135 (b)90

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