If \[\mathbf{a}=\mathbf{i}+\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2\mathbf{i}+3\mathbf{j}+\mathbf{k}\] and \[\mathbf{c}=\mathbf{i}+\alpha \mathbf{j}\] are coplanar vectors, the value of \[\alpha \] is [UPSEAT 2004]

If \[\mathbf{a}=\mathbf{i}+\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2\math

1.	If \[\mathbf{a}=\mathbf{i}+\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2\mathbf{i}+3\mathbf{j}+\mathbf{k}\] and \[\mathbf{c}=\mathbf{i}+\alpha \mathbf{j}\] are coplanar vectors, the value of \[\alpha \] is [UPSEAT 2004]
A.	\[-\frac{4}{3}\]
B.	\[\frac{3}{4}\]
C.	\[\frac{4}{3}\]
D.	2
Answer» D. 2

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If \[\mathbf{a}=\mathbf{i}+\mathbf{j}-\mathbf{k},\,\,\mathbf{b}=2\mathbf{i}+3\mathbf{j}+\mathbf{k}\] and \[\mathbf{c}=\mathbf{i}+\alpha \mathbf{j}\] are coplanar vectors, the value of \[\alpha \] is [UPSEAT 2004]

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