A vector of length 3 perpendicular to each of the vectors \[3\,\mathbf{i}+\mathbf{j}-4\,\mathbf{k}\] and \[6\,\mathbf{i}+5\,\mathbf{j}-2\,\mathbf{k}\] is

\[-\,2\,\mathbf{i}+2\,\mathbf{j}+\mathbf{k}\]

\[2\,\mathbf{i}-2\,\mathbf{j}+\mathbf{k}\]

\[2\,\mathbf{i}+2\,\mathbf{j}-\mathbf{k}\]

A vector of length 3 perpendicular to each of the vectors \[3\,\mathbf

1.	A vector of length 3 perpendicular to each of the vectors \[3\,\mathbf{i}+\mathbf{j}-4\,\mathbf{k}\] and \[6\,\mathbf{i}+5\,\mathbf{j}-2\,\mathbf{k}\] is
A.	\[2\,\mathbf{i}-2\,\mathbf{j}+\mathbf{k}\]
B.	\[-\,2\,\mathbf{i}+2\,\mathbf{j}+\mathbf{k}\]
C.	\[2\,\mathbf{i}+2\,\mathbf{j}-\mathbf{k}\]
D.	None of these
Answer» B. \[-\,2\,\mathbf{i}+2\,\mathbf{j}+\mathbf{k}\]

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A vector of length 3 perpendicular to each of the vectors \[3\,\mathbf{i}+\mathbf{j}-4\,\mathbf{k}\] and \[6\,\mathbf{i}+5\,\mathbf{j}-2\,\mathbf{k}\] is

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