1.

If the position vector of one end of the line segment AB be \[2\mathbf{i}+3\mathbf{j}-\mathbf{k}\] and the position vector of its middle point be \[3\,(\mathbf{i}+\mathbf{j}+\mathbf{k}),\] then the position vector of the other end is

A. \[4\mathbf{i}+3\mathbf{j}+5\mathbf{k}\]      
B. \[4\mathbf{i}-3\mathbf{j}+7\mathbf{k}\]
C. \[4\mathbf{i}+3\mathbf{j}+7\mathbf{k}\]
D. \[4\mathbf{i}+3\mathbf{j}-7\mathbf{k}\]
Answer» D. \[4\mathbf{i}+3\mathbf{j}-7\mathbf{k}\]


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