1.

If ABCD is a parallelogram and the position vectors of A, B, C are \[\mathbf{i}+3\mathbf{j}+5\mathbf{k},\,\,\mathbf{i}+\mathbf{j}+\mathbf{k}\] and \[7\mathbf{i}+7\mathbf{j}+7\mathbf{k},\] then the position vector of D will be

A. \[7\mathbf{i}+5\mathbf{j}+3\mathbf{k}\]      
B. \[7\mathbf{i}+9\mathbf{j}+11\mathbf{k}\]
C. \[9\mathbf{i}+11\mathbf{j}+13\mathbf{k}\] 
D. \[8\mathbf{i}+8\mathbf{j}+8\mathbf{k}\]
Answer» C. \[9\mathbf{i}+11\mathbf{j}+13\mathbf{k}\] 


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