A) \[[\alpha \,\,\beta \,\,\gamma ]=0\]
B) \[[\alpha \,\,\beta \,\,\gamma ]=1\]
C) \[[\alpha \,\,\beta \,\,\gamma ]=3\]
D) \[[\beta \,\,\gamma \,\,\alpha ]=1\]
Correct Answer: A
Solution :
As vector \[\alpha \]lies in the plane of \[\beta \] and \[\gamma \] Þ \[\alpha ,\,\beta ,\,\gamma \] are coplanar Þ \[[\alpha \,\,\beta \,\,\gamma ]=0\].
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