The value of x for which the angle between the vectors \[\mathbf{a}=x\mathbf{i}-3\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2x\mathbf{i}+x\mathbf{j}-\mathbf{k}\] is acute and the angle between the vectors b and the axis of ordinate is obtuse, are

The value of x for which the angle between the vectors \[\mathbf{a}=x\

1.	The value of x for which the angle between the vectors \[\mathbf{a}=x\mathbf{i}-3\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2x\mathbf{i}+x\mathbf{j}-\mathbf{k}\] is acute and the angle between the vectors b and the axis of ordinate is obtuse, are
A.	1, 2
B.	? 2, ? 3
C.	x > 0
D.	None of these
Answer» C. x > 0

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The value of x for which the angle between the vectors \[\mathbf{a}=x\mathbf{i}-3\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2x\mathbf{i}+x\mathbf{j}-\mathbf{k}\] is acute and the angle between the vectors b and the axis of ordinate is obtuse, are

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