If \[\mathbf{x}\] is parallel to \[\mathbf{y}\] and \[\mathbf{z}\] where \[\mathbf{x}=2\mathbf{i}+\mathbf{j}+\alpha \mathbf{k}\], \[\mathbf{y}=\alpha \mathbf{i}+\mathbf{k}\] and \[\mathbf{z}=5\mathbf{i}-\mathbf{j}\], then \[\alpha \] is equal to [J & K 2005]

If \[\mathbf{x}\] is parallel to \[\mathbf{y}\] and \[\mathbf{z}\] whe

1.	If \[\mathbf{x}\] is parallel to \[\mathbf{y}\] and \[\mathbf{z}\] where \[\mathbf{x}=2\mathbf{i}+\mathbf{j}+\alpha \mathbf{k}\], \[\mathbf{y}=\alpha \mathbf{i}+\mathbf{k}\] and \[\mathbf{z}=5\mathbf{i}-\mathbf{j}\], then \[\alpha \] is equal to [J & K 2005]
A.	\[\pm \sqrt{5}\]
B.	\[\pm \sqrt{6}\]
C.	\[\pm \sqrt{7}\]
D.	None of these
Answer» D. None of these

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If \[\mathbf{x}\] is parallel to \[\mathbf{y}\] and \[\mathbf{z}\] where \[\mathbf{x}=2\mathbf{i}+\mathbf{j}+\alpha \mathbf{k}\], \[\mathbf{y}=\alpha \mathbf{i}+\mathbf{k}\] and \[\mathbf{z}=5\mathbf{i}-\mathbf{j}\], then \[\alpha \] is equal to [J & K 2005]

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